I'm thinking of pushing my daughter down the hill on her crutches.
I sure do hope you're joking. Why would you think about doing that?
I really don't know why I was thinking of this.
It sounds like your daughter is disabled, and I find it difficult to understand why you would want to push her down the hill. A parent should be the one who is wanting to always protect their children, and I don't think you even know how problematic it is for you to do otherwise. If you are unable to take care of your daughter, I suggest that you let your husband do the parenting from now on.
I want to push her hard and maybe make her lose her balance.
Please don't push her, should become even more hurt. If you feel like you need to harm something there is nothing wrong with going to see a therapist. If you push her and something goes wrong you will regret it instantly.