Glad to hear she is doing better. In my experience (4 knees and 2 hips), each dog reacts differently the first night home. Baileys cried both times and Burt barely made a whimper. I did not get to see how Millie did the first night as she stayed at the vet the first night.
One word of caution. Dogs seem to have a much higher tolerance for pain and she will want to use the leg much sooner than she should, so be sure to keep her on a leash and to keep her activity to the exact prescribed levels for recovery. That will allow what has been done to heal better and increase the odds that she will not blow it out again- which happens more than you would think. I find the hardest part of the surgery is keeping the dog from playing when they feel good enough to do so!
Good luck and give her a smooch on the forehead for us all!
-John