You're fine. Don't stress out too much over it. An overreaction? Probably. But you taught a lesson, and you didn't physically harm her. I've thrown toys in the garbage, same effect.

Here's a story that should make you feel better about what you did. My son is 9. He has chores he has to do. One of them is doing the dishes. He did his chore, but did it terribly. So I made him re-do it. Instead of doing that, he stood there crying about how unfair I was. I informed him that if he wasn't going to do his chores(in my command voice that I inherited from my military father) he could go to bed and be grounded for the next day.

Well, he just started crying louder. So I told him(again in my command voice, I am trying to work on this) to get his butt to bed. He refused, and started crying louder. So I decided to escort him to his room. I put my hand on his back and started to guide him towards his room. He planted his feet, I pushed harder.

You can guess where this is going. He planted, I pushed, and my 9 year old wound up on the floor. I felt absolutely horrible. I picked him up, and hugged him. I apologized profusely. Then I carried him to his room and told him I was sorry for pushing him down, that it was an accident and that I would never do that again.

I felt like a terrible parent. I can count the number of times I've spanked my kids on one hand. Otherwise I've never hit, slapped or otherwise laid anything other than a loving hand on my children.

Point being, learn from it. Even with me feeling terrible about accidentally shoving my kid to the ground it wound up having the desired effect. He does his chores, and if he doesn't do them right the first time he redoes them with no complaints.

I learned I need to be a better parent, he learned he needs to put 100% effort into his chores if he doesn't want to have to keep redoing them.