It seems like she's very stressed and anxious at dog training. I don't know enough to guess at why. But if you can get there before the other dogs get there and try her with the yummiest treat, she might start to feel a little better.
I suspect the physical force methods prefered by the trainer might add to the stress too. If there is a chief instructor you might want to seek them out and discuss options with them. Our dog club always has loads of instructors all with their own styles. Some are gentler than others or just work better for some dogs than others.
If there is only one instructor, try to get hold of her before class and discuss the issues. Calming signals on your part may help too - the lip licking thing and not direct eye contact. Ask other people not to look/stare at your dog directly too. And if you want to do the dog greeting thing, get the other people to hold their dog still and allow your dog to approach if she wants or not if she doesn't, rather than letting the other dog(s) stand over her. If she manages to make some doggy friends about her size she might feel better. Frosty lights up when she sees her friends at dog training. And I keep her away from the "nasty" dogs.