She's on an antibiotic. The last general vet I took her to tried to give her penicillin....
Then you step in and ask for baytril. A general vet will generally listen to you once they realise that you have got a good idea of guinea pig care.

I did have to tell the treating vet last weekend that I wanted zantac in addition to emeprid, but he did diagnose the problem correctly.
It is your judgement as a responsible owner whether your piggy can make it through the weekend with whatever treatment she has got or not. I agree that is always a stressful time.