I have a Jacob Frederick Mouser (Mauser) b.Sept. 26, 1740 in Charlottenhof, Germany. He married Catherine Shedaker in 1766 in Pa. and died 1799 in Lincolonton, NC. Your Fredericka could have been a descendant of this Jacob Frederick. When Jacob came to Pa. the spelling of his name got changed from Mauser to Mouser....but not all the family's got changed at that time. This family line went from Germany to Pa. to NC to Ark.