It's been over 20 hours now lol

Backstory: I live in an off campus apartment near my college. Im 20 and have never been in a relationship before. So yesterday I took the elevator to pick up a package and there was a girl inside. She was literally exactly my type physically. So we're in the elevator and she says "Sorry that i dont have my mask on". We both laugh and I respond saying that it's ok. I then ask her how her day is going and from there a conversation striked up and I found out that we had some stuff in common (similar major, same classes) and then we happened to both be going to the mail room to pick up a package so the conversation continued and we talked about various other things like dealing with covid etc. So I then asked her if she has snapchat and she responds saying yes so I add her on there.

I then said my goodbyes to her and wished her well. So later that day around 7 pm I messaged her on snapchat saying i enjoyed talking toher and was wondering if she wanted to go out on Sunday for ice cream. It's currently 5 pm and she hasnt even opened the message (it still says delivered) lol. Do yall think she isnt interested? I feel like she also isnt on snapchat that often because her snap score didnt increase at all today.