My friend thinks I stood her up, and blocked me on Snap. What do I do to explain?

Ok, i asked my friend if she wanted to hangout last Friday, and she agreed. I use snap and insta to talk to her, but mainly snapchat. I ended up having to reschedule, because i didn't have enough time to finish getting ready to get on the bus for a wrestling match, and i let her know about an hour and a half before we were going to hangout. This was on Instagram, because my phone with snapchat was packed in my duffle in the back of the car.

Fast foward to Saturday, i checked snapchat, and saw that i couldn't see our chats, and she was no longer in my friends list. I couldn't re-add her, so i tried checking Instagram, and i wasn't blocked on there, but she doesn't check her Instagram all that much, so the message from Friday wasn't seen.
I waited till Tuesday, and was looking for her at school to try and talk to her about it, but she has been sick all week, and i have no way to talk with her about it. I also dont want to do any thing overly desperate like make an alt snapchat, but it may be the only way.
My friend thinks I stood her up, and blocked me on Snap. What do I do to explain?
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