OMG your poor baby
I hope she's going to be OK, and I'm so glad you caught the other dog intime before he did any more harm to her.
She will probably be traumatized the rest of her life, especially after 2 incidences happening so close together. I wouldn't blame you if you didn't bring her around bigger dogs anymore, just for the simple fact that she might be to terrified.
What happened to the other dog? I'm assuming your giving him back to the shelter?
Good luck with her recovery!