Don't worry. She has only made up her mind based on how she currently feels about you, which you can change. Right now, she feels turned off by the mistakes
If you try to get a woman into a relationship before you've even made her feel sufficient sexual attraction for you, she might also say that you're coming on too
Doctors, what was the dumbest patient encounter you've ever had? If she says lets be friends well that's what she is feeling in the moment