If she was a fighting Pitt she would have definitely in a heart-beat went after your baby/babies. Fighting Pitts are social with humans , cause they are used to being beat so she would have been ok with you for fear you would hurt her , but no way with another dog. I don't think she was used for fighting. Another thing fighting Pitts are just not let go, when their time is up in the "Ring" they are killed.
I think she is gorgeous and I think your an angel. With all the talk about Pitts you still opened your heart and home for this baby girl. You are one special lady..
Good Luck !