Drop In booking, owner not responding to messages about key?
So I've done many drop in visits; some with me picking up a key and some without meet and greets/key (but with some way of gaining entry). I tried to schedule a meet and greet with a potential client who at first was responsive and wanted to meet me but after we agreed to the booking she didn't return my message about when to pick up the key. The next morning I message her (no response). Two days later, no response. The booking is in 3 days and I don't want to get penalized if she doesn't respond. What should I do?