Poor baby. I'm so glad she's home. That's got to make her feel some better. Lucy hurt her right back leg a couple of months ago jumping off a chair. I took her to the vet for x-rays and it wasn't broken, but she wouldn't put it down at all. I was so afraid the vet had missed something that I was going to take her back.
My son suggested filling the bathtub up with warm water ( deep enough to make her swim) while supporting under her belly with my hand. It worked and she was full speed in about 3 days.
I don't know if you can do this with your baby because of stitches, but you might ask the vet if swimming would be good after the stitches come out.
Kim & Lucy