I am amazed that you do not know the following about your grandmother, but she was very interested in heraldry during the Third Reich and designed a coat-of-arms for herself after the birth of her first son. She was also born in 1919 not in 1911 and was officially declared "dead" by the Catholic house of Oettingen-Spielberg when she joined the Vril Gesellschaft at the age of twelve. You seem to be slightly confused about the identity of your grandfather as well, which is perhaps less surprising as Hans-Georg von Altenstadt was considered a war criminal because of his slaughter of the Jews at Kamenez-Podolsk in the Ukraine. So perhaps it is not so amazing after all that you did not know some of this.
Had they won the war, your grandmother would have been considered a priestess of the new religion of Vril, whose symbol resembled two crampions combined. As she had left the Catholic church and joined this new religion with Maria Orschitsch as its high priestess, she reinvented for herself a new family, complete with titles and coats-of-arms, "by the grace of the Vril".
Franziska zu Oettingen-Oettingen und Oettingen-Spielberg had been dedicated to the Vril Society by her aunt, also named Franziska, in 1932. The elder princess was Franziska Romana, who donated a diamond tiara to the Vril as her niece's dowry, much like the dowry of a nun. The Oettingen family responded by not only disowning their daughter, but went so far as to have a Catholic burial rite performed over an effigy (some say a substituted corpse). Franzeska, after her 1937 marriage to the baron von Schmidt auf Altenstadt, declared herself head of a new "dynasty" of Oettingen-Altenstadt with herself as its founder and head "by the grace of the Vril" rather than God. She believed at that point that Germany would win the war and the Catholic religion would be obsolete.
In 1938, after the birth of her first son, Franzeska really "cooked the books" and designed a coat of arms for her new dynasty. As her maternal grandmother had been a Hohenlohe-Waldenburg-Schillingsfuerst she took the eagle crest (per fess argent and gules) above the shield argent two lions sable passant for Hohenlohe and the name Hohenlohe to represent this ancestress who was not however an heraldic heiress. This she quartered with her maternal grandfather's arms, crest of a demi-deer gules above a shield argent two lions rampant back to back with their tails entwined for Rechberg of Rothenloewen and the name Rechberg...thus suggesting that her mother was a Hohenlohe-Rechberg.
The princess did not similarly alter her father's ancestry, ignoring the fact that his mother had been an Esterhazy, as she did not employ the Esterhazy coat-of-arms. She quartered Oettingen twice as the first and fourth quarterings, making Rechberg the second quarter and Hohenlohe the third quartering of her own coat of arms. Realise that this would not have been proper marshalling (under normal circumstances) even had the ladies in question been heraldic heiresses, which they were not;however, your grandmother was not marshalling arms as though she were a subject of any other monarch, but quite as though she were a sovreign lady in her own right. She placed the arms of von Schmidt auf Altenstadt as a centre-shield to represent her consort's line and proceeded to make a unique arrangement of the crests involved above the shield: the Oettingen crest of the Hundsgulden or Golden Hound was placed in the centre of five helmets (which is a German practis, although the arrangement is not traditional), flanked by the Hohenlohe and Rechberg crests. As you VIEW it the Hohenlohe red-and-white eagle is to the LEFT lined up above the third quarter where the Hohenlohe arms are represented, and the red half-deer of Rechberg is to the RIGHT immediately above the Rothenloewe arms in the second quarter. In the language of blazonry, of course, you would describe this from the point of view of the BEARER of the arms, so the Hohenlohe crest would be to the "dexter" or right of the Dog of Oettingen and the Rechberg deer would be to the "sinister" or left of the Dog, from the Dog's point of view.
Finally, your grandmother did something unprecedented in the history of heraldry, as far as I know: she split the Altenstadt crest into two separate crests and placed them on two seperate helms to the outer edges of the arrangement, thus: the swan with the halo on the log of Sommopfle is on the outside next to the Hohenlohe eagle crest, while the armoured arm wielding a sword and issuing from a cloud, is placed on a fifth helmet at the opposite edge and next to the Rechberg deer crest.
This was described as the coat of arms of the Princely House and Dynasty of Hohenlohe-Rechberg-Oettingen-Altenstadt in a pamphlet published by the Vrilgesellschaft and had a picture of your grandmother with the characteristic long hair of a Vril Dame reproduced opposite it in the Frontispiece. Again, the arrangement of names was as unique as the marshalling and quartering of the arms thus. Had her ancestresses been heraldic heireses, which again, they were not, the names of the German royal and noble houses involved would not have been combined in this way, under normal circumstances. But, having declared herself head of a new "dynasty" she could do pretty much as she pleased.
The intention in starting a new religion for Adolph Hitler and the Third Reich had been to bring in alien technology from Aldabaran and establish kingdoms all over the planet which ruled by the grace of the Vril religion. Franzeska was to have been a queen somewhere not stated in the pamphlet as well as an official in the new faith, and specified that female remainder rather than Salic Law was to be the house law of her new dynasty.
I suppose that you were never told of this in the oppressive atmosphere of a post-war world in which the Allies had prevailed, but there was, from 1938 until 1945 at least, a dynasty of the princes Hohenlohe-Rechberg-Oettingen-Altenstadt, and a coat-of-arms for it as well.