There are a lot of Carr Allen's listed - born varying dates
Carr Allen b. 1786 VA died 1868 Raleigh Co, WVA
Carr Allen b. 1814 and died 1849 Carroll Co, VA maried Jane Lafferty - 8 kids
Carr Allen b. 1841 Carroll Co, Va died 1898 same - married Mary Ann Jones - 4 kids
Carr Allen b. 1849 Wyoming Co, WVA died before 1880 married Cordelia Hendricks - 6 kids
This info:www.worldconnect.rootsweb.com "advanced search"
evidently the Allen family liked to continue using the name Carr!
You will have to search through various information to find the daughter Mary Polly Allen - but knowing she was born in KY should help - I didn't try to find out which of the above (and possibly more) moved to KY -