The data I have on Maria Kellow is as follows:I have a birth or christening date of 9th November 1827, Totnes, Devon.There are a number of Kellows listed as being born in or residing in Totnes, and the person who seems the most likely candidate for being Maria's father is John Kellow, who was born in Totnes circa 1800, and who we have listed as being married in 1820, Totnes (spouse's name unknown).This John Kellow is my husband's GGG Grandfather.The only child we have listed for him to date is his son John (my husband's GG Grandfather) but I'm sure there were other children - we just haven't tied them in yet.
If that is the case, and you are descended from this line, we have vast amounts of info on your Kellow ancestors, stretching back to their origins in Cornwall, in the area of St Teath and St Kew.
Out of interest, I also did some checking on the Pearce connection, in the hope that this might give a hint towards Maria's family origins.Alas, it didn't but I have discovered the following :
Theophilus Pearce, born/baptised 27th Dec 1814, Lanteglos, Cornwall.Son of:
Thomas Pearce,(born/baptised 7th Nov 1790, Lanteglos, Cornwall) and Ann Taylor (born circa 1795, Totnes) who married 6th Oct 1810.
Thomas Pearce's parents: Thomas Pearce (born circa 1754) and Susanna [maiden name unknown] (born circa 1754).
Do let me know if this in any way fits the details you may already have.