Proof of sale only ---- how to register in Virginia

Help!   I just bought a 1967 Serro Scotty Highlander from a lady.  She said she could not give me the title because she needed it for her records but if I sent a copy of the bill of sale and told them, in the state from which she bought it they don't need registrations for campers less than 900 lbs and this old, I could register it with no problems.   I had her take a picture of the title she had, front and back, and email it to me and I have the bill of sale.   Am I going to have problems getting this registered in VA?  Any tips on what I should do?   Any help would be greatly appreciated.