So I cold approached this college girl in the college library.

I used a joke as the opener and asked her out.

She said "I am down". We exchanged numbers then I suggested a date on Saturday. However, she said she has a friend coming to visit her this weekend.

She said we can go out after her finals(next week). What should I do?

I texted her my name and she texted back her name with a "!".

For context, I am an average-looking guy, not ugly but unattractive. In the past two months I have cold approached more than 100 attractive girls and got rejected/boyfriend/(a few)ghosted all the time. She is very attractive.