Unless you received any type of registration paperwork from her previous owner at the time of "adoption", then unfortunately, no, you will not be able to register her. I'm so sorry to have to give you this news, but it's the cold, hard truth. Just love her, continue to train her, and be a representative of the breed and breed types.
You didn't lose your girl, you just lost your turn!
"In this breed, there's no such thing as an expert! The day someone says they're an expert, they need to walk away from the dogs, because someone's going to get hurt. You should be learning something new every day." John Maynard-Circle M Kennels