Cut her food in matchstick sized slivers and push them into her mouth. If you can get them back to her molars, she'll be able to chew and eat them.
I'd be going back to the vet and complaining, especially since you told them not to cut them too short.
The good news is, GP teeth grow very fast, and it shouldn't be more than a few days before they're long enough to meet.
Darn tootin' I am contacting that vet! In fact, I already called, he wasn't there, but the receptionist will have him call me tomorrow. I was trying matchsticks today and she wouldn't take them, but once the Reglan helps move things along, I think I'llhave more success. She is only taking 5 cc's at most in one sitting. That means feeding her every 2 hours. Way too much stress on her.