Squeak??

Ok, well here is my problem. My gf was driving her car (97' Cavalier 2.4l 5sp) and she was driving down the highway and came to a stop. She stopped the car in 4th gear without putting the clutch in. There was a lot of "movement" from the engine. Now there is a problem. When ever she starts to move from a stop or hits a bump there is a "squeak" noise. Almost sounds like metal on metal. I'm not too sure what this could be. I don't know much about these kinds of cars. Any help would be very very helpful. Thanks.

Check motor mounts.

first teach her how to properly stop and to push in on the clutch. second check motor mounts and brake lines. a brake line could have collapsed when the car shakes if you dont push in the clutch with the brake when stopping.