Hi and welcome to PT! I live in TN too.

I've never heard of anything to correct declawing but I've never looked into to it either. So sad to think she was outside on her own with no claws to defend herself. She's lucky you took her in.

As for being spayed, did your vet have any clue? I'm just wondering since the name on the tag was Jasper is it possible she is really a neutered male - a he maybe?

The best way to handle introducing the cats is to keep them apart at first and let them get used to each other's smell. Maybe you could give Jasper a towel or blanket that the other cat has been on to let her get used to him that way. Every time I've introduced a new cat it's been an ordeal and they take a long time to get along. Some never have gotten along well and they just coexist, barely.

Maybe some other members here will have some better suggestions and ideas for you. Good luck.