I was you three weeks ago!
If it helps, my baby girl is completely and totally back to normal. The first days are hard, but then the incision starts to close, the medicine wears off and your biggest concern is going to be keeping her calm!
My little one was out of it and sore the first day after and then each day thereafter she made marked improvement. She also had 10+ teeth pulled during her surgery.
Stay calm, keep her near you, pick her up by scooping her up by the tush and come back to YT!! There is always someone online whose experience and knowledge will help you through any panic. Its a great resource.
Also remember you did your part to aid in the pet overpopulation crisis! You did the right thing for your furkid's health as well! Congrats on surviving the worst too both of you!