Oh Souraya, from my point of view you did the right thing. Of course we want all the dogs to be rescued, but if you couldn't handle her it would not work out. Not fair to you, not fair to Lilli and not fair to Drake. What if you got her home and on top of all that she didn't get along with Drake.
I know exactly how you feel, we were going to adopt a little Schnauzer from a girl who was going to have a baby (afraid the dog would hurt her child) They brought her down to us from Los Angeles and I fell in love with her. She was so cute and wanted to play with our dogs. During the afternoon Perry attacked her three times. In the process Don got bit on the hand. We even kept her that night, but Perry kept it up and we decided to return her for her safety and Don drove up to Los Angeles the next day with her. It turned out o.k. she was given to her groomer who loved her so much, a happy ending, but I cried all night. Sometimes these things don't work out the way we want them to, but we must think what is best for everybody.
Jackie