I think everyone said what I was thinking. Spay her and then tell your friend.
I was told by the breeder that I could use Copper as a stud, but I didn't want to do that. I wanted him to be a pet and live a spoiled no stress life.
I had him neutered. He is a happy, spoiled little boy. I feel blessed to have him.
Stick to your guns and just love your little girl!