Oh poor MayaLinn, she must have been so frightened, and the other dog too. :( I hope she won't be scared to go the vet again. Next time, put your feet on her carrier. ;)
All vets ought to be prepared for such incidents and have somehing standing near the reception to break it up - or better, the owner of such agressive dogs should give it a tranquilizer or put a muzzle on before the visit.
Kisses to Maya Linn.