<human>: Condense the text into a few key points

Hello all, I'm a male and we both are 18 years old. We have been together for 1 year and 9 months with no complications so far besides the occasional argument. I'm in a happy relationship with lots of communications and general well being, she is also my classmate. 

My question is regarding an event that happened today.

A new school year recently started and we both got to be partners in class for a course she has some difficulties understanding. Before the new year started, she asked me if I could help her with whatever doubt she might have. I naturally said yes. 

The problem is that today I tried helping her two times, both times didn't go so well... In the first I thought she made a mistake so I asked her to correct it but afterwards, in the correction, it seems she was right all along. The second time she required help (I, in order to avoid having the same "douchey" feel as in the first time) made a quick reading of what she had made and found no mistakes so I said she was 100% correct. Afterwards, thinking she had it right, volunteered to correct that exercise in the board, which proved to have some errors that made her feel "dumb" in front of the class.

Least to say she became disappointed and a bit sad with me because I, that promised I would help her, did nothing but handicap her so far.

While we do talk it is visible she is upset/angry with me, which of course, makes me feel like shit. Seeing your loved one disappointed with you.

We are now only together on Friday morning.

I think I could say that after the class ended we talked about what happened, I told her I'm sorry for being such an unhelpful person and that I would not let her down again.

I don't know if I should make contact with her tomorrow to see if everything is alright or if I should give her time to be in a better mood by Friday.
<bot>: Made my GF feel like a dumb person after trying to help her twice, naturally she is upset with me. Should I do something or let her forget it?