I think your Rebecca might be the sister to my distant grandfather Samuel Owen Day. Samuel Day 1757-1820, married Margaret Cohagen, and had nine children being Ransom, Addison, Allison, Ovington, Demoval, Hedgeman, Dorcas, Rebecca, and Samuel Owen. They were from what is now Pendleton Co. WV, was then VA. They moved to Ross Co Ohio after Samuel Owen was born. Please let me know if this sounds correct. I have a lot more information on the family if this is your grandma. Thanks!