Quick- help please what is appropriate punishment?

[SkinnyDecaffGiraffe]

My 4yo had just slapped me in a tantrum. So hard its left a red mark on my arm.

Tantrum is because I followed thru on a warning on something.

I've sent her to her room for now. What should I do here. I'm so cross I can't think clearly.

I'd already warned her when she was kicking and screaming that if she hit me what the next consequence was i.e. her room but I'm not satisfied its enough

You ignore the slap.
She did it because she's cross and lost her ability to control herself. Or perhaps she wanted a rise, because you were in control. Continue punishment for original transgression.
When she is calm talk to her about nit hurting others.

If you continue to punish for things she does whilst receiving punishment for something else it becomes a huge power struggle and the lesson for the original transgression is lost. One thing at a time, regardless of how mad you are.

Thanks drink.
She is now playing calmly in her room.

I'm leaving her to it for a few minutes whilst I try to settle baby for a nap. Fat chance she will nap now!!

Will talk to her again about hitting.

Id go have a cuppa! Just when you think you've got a handle on their behavior and "stages" they come up with something else! Aghhhh!

Thank you drink. Without your intervention I would have punished the slap.
She did apologise for it after a chat.

Thanks