My cat tried to get out the screen door, and I was holding it closed?

She always tries to run out at my feet so I just barely opened it while I reached out to grab the mail and she nudged her head against it REALLY hard that i felt the door start to push open and I was holding it closed with enough force so she couldn't get out, do you think this hurt her head? I mean, she surely wouldn't hurt herself trying to get out would she?