Was restraining someone and leaving a couple bruises overdone?

A couple people spread rumors about me and some girl. She believed them all and I tried telling her it's false. We have never gotten along with each other but now she wanted to fight me.

Her first slap attempt was blocked. I told her this is ridiculous. She tried to go for another slap and it was blocked once again. In a serious tone, I said ''this is your last warning, stop right now.'' The thing is I know my level and strength so I didn't really want to hurt her badly.

Then she tried going for a punch. It got deflected and I pinned her down hard. She ended up pleading to let her go. It left a couple bruises on her arm. I felt kind of bad though. I didn't want to fight her. Yet at the same time, I'm not going to stand there and let her attack me. Do you think I overdid it or not? She almost would've gotten suspended if it weren't for a couple witnesses.

Was restraining someone and leaving a couple bruises overdone?
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