Yes, how old is the dog? How well socialized was she? Is she aggressive with all dogs? or just other female dogs? small dogs, yappy dogs?,etc.
What if she meets a dog off leash what would happen then?
I would take up Heathers offer to advise you of where to go for help.
It's kind of dumb for a class not wanting to take you till you get help. This is what a class is for.
Gina