I agree! Bring her in.
If you could get a trap or somehow get her, then just set her up in a bathroom or secluded room. Spend time in the room with her, just reading or doing whatever, not directly related to her. This is what I did with Paizly. She was in the guest room and I would go in and watch TV in there on the floor. It works!
Or, if you don't want to trap or capture her, you could do as Randi suggested if you are able to do it that way. My house is not set up where I could do this procedure.
Good luck!