Did I overreact - 6 year old accidentally hurt 1 year old

We have a heavy dog gate that divides the front of the house from the back. 1 year old can't move it and I've told 6 year old at least 50 times since we've had it not to touch it.

I go pee. I hear a loud boom and crying. 6 year old took the gate and pushed it to the hallway and then straightened it completely. Usually it is like a zig zag so it can't tip in the entryway we have it in.

Our 1 year old fell face first with the gate and scraped her feet up pretty badly.

I know it was an accident but I got so upset I yelled at 6 year old for moving around the gate as I've told her many times it's not a toy. As I cleaned up 1 year olds feet I told oldest this is what happens when you move it when I'm not around, don't touch it again. I said this in a stern, raised voice.

She got upset with me and left the room.

Now I'm feeling upset and guilty that I overreacted.

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