This Caroline Combs could be your Caroline or perhaps married daughter of Joseph Blevins? Just dug around for a few minutes so maybe nothing new here for you. That she lives next to Wm. Combs certainly is curious!
Alleghany wasn't formed until 1859 as I recall. Try the 1860 Wilkes Census: Traphill. Image 31 of 199: 1860; Census Place: Lower Division, Wilkes, North Carolina; Roll: M653_918; Page: 16; Image: 33.
Joseph Blevins 60 + Nancy Blevins 60 + Mary Blevins 35 + Alvis Blevins 25 + Eli Blevins 22 + Nancy Blevins 6 + Alvis Blevins 3 + Caroline Combs 23 + Nancy J Combs 1.12
Living next to
William Combs 56 + Libey Combs 58 + Harrison Combs 21 + Milly Combs 18 + Meridith Combs 15 + Miry Combs 12.