My puppy.. :(

Sadly, after months of trying to get her to listen, and training, she still can't behave. I can no longer continue to pretend these problems do not exist, and she has to go... I'm very upset with this fact, but with my son coming in the next couple months, I can't keep her.. My mother put her up on Craigslist this morning.. I don't know how to feel about this. I know I can't keep her because she is going to cause serious problems when Karter comes.. But I feel horrible.. Like I'm abandoning her.. I can't stop crying. I'm not sure what to do anymore.. And I hate how upset I am by doing what I feel is best for my son... UGH! It's going to be a rough afternoon.. </3