Poor baby - I dont know why some vets give medication and some don't -
I THINK (Call an ER Vet to double check) you may be able to give her a tiny bit of baby asprin.... but I'd def call someone before doing this. There's lots of ER Clinics open at night and many times will tell you if you ask them what is safe and what isn't after a 'procedure' (operation)
good luck !