baby rat injury! URGENT

Question
I have a rat that is a little older than three weeks. I was letting her run around in my bathroom and my mom accidentally squooshed her with her leg! She says she didn't put all her weight on it, but the baby is now walking slower, slightly hunched, and weezing. At first she was gasping, but she stopped after a few minutes. PLEASE I DONT WANT HER TO DIE!!!!!!!! I don't know what to do for her! I tried putting her back with her mom and siblings. Please help me! What should i do!

Answer
 You need to take her to the vet right away.  Waiting for somebody to respond by email is not a responsible decision when a rat is injured.  It sounds like she is pretty badly hurt and may not survive without veterinary intervention.  I really do hope that she is okay!