I'm having problems verifying Margaret Burton's origins. I have seen dates of her birth around 1864. By your dated listed of 1874, she couldn't be the daughter of Susannah (Harper)Burton as she had passed by that time.
Margaret does not appear in the 1870 census with Caleb Burton's family but does appear in the 1880 census with an age of 16 and listed as a daughter. Is there any chance that Margaret is the daughter of Caleb's second wife, Elizabeth Burchett from a prior marriage? Information is murky.