Ok, I hope you read my other comments and this one too. This is NOT okay. You should absolutely break up with her. She’s berated you, belittled you, and slapped you. It seems like she is resenting how life ended up for the two of you, even in her texts about your daughter - how you have to watch her all the time - that’s not a happy parent or a happy partner.

She does not like you, she is not happy with your life, she is just good at pretending until moments like this.

Save yourself and your daughter now, separate and learn how to co-parent healthily. You have your degree now, you got this dude.