When mine used to go to the groomers, Vegas would be at the vets within a few days because of his anal glands - without fail! I always put it down to a weird coincidence as the groomer never mentioned emptying them but it never seemed to happen once I started clipping him at home
A ruptured anal gland sounds very painful - poor girl
Hope the antibiotics kick in quickly and she feels better really soon
If the vets aren't too far away from you, it might be an idea, once she is better, to just pop along when they are quiet and sit in the waiting room with her for a few minutes with some yummy treats then leave - that way she shouldn't start to associate the vets with only bad experiences.