Help, I'm stuck between a rock and a hard place :(?

I think that it great what you are trying to do. I think that you should take her home and train her then try to find her a new home. Especially if you think that she is going to be put down. You will be giving her a second chance. Then even if it doesn't work out the way you planned at least you can say you done all you could for her. Good luck with you decision whatever it may be.