[Lola B Marie]

If you decide you can't keep her, you can call Best Friends animal society. The number is 435 644 2001. They take dogs in even if they have a bite history. They might be able to help her and rehome to a place with lots of land and no children. They took in almost all of Michael Vick's dogs and are working non stop to help them. Give them a call, explain your story and they will help you.
The address is 5001 Angel Canyon Rd
Kanab, UT 84741.
The best thing of all, is they let you visit and you can send presents and food and toys. You did everything possible with your girl. You and your family should not have to live in fear of your pet. Like the others said, A dog should be a valued family member and a joy to have. Not all relationships work out. Let her go to a place where she can be helped with her aggression and not be PTS.