So, there's this girl in my college from another division, I asked her out for a coffee date next week on text, she has not replied yet?

It turns out she knew me before ( I didn't know about this), and she also followed me on IG and approached me in college saying "Hi!",, It was after this I asked her out on text saying ,"Would you like to grab a coffee next week?" , She said, "Yeah sure, I'll let you know once I'm free" That week has started today, and she has not replied yet, should I still wait, will she "let me know" ?
So, there's this girl in my college from another division, I asked her out for a coffee date next week on text, she has not replied yet?
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