Reading this from the perspective of a guest, at first I thought of how I would feel -- irritated at being asked to leave, being inconvenienced, having to find another place to stay, repacking, getting transportation, etc. Your profile says you've traveled a lot, so I'm sure you can imagine what a hassel this would be, and maybe feel put out as I would. Or perhaps you've traveled enough that you know wrenches often get thrown in plans, and I get that, too (boy, do I get it).
But then I looked at the listing. You mention shelter in place in the title and in the description. You're clearly conscientious about precautions for the epidemic. If I were the guest, I would have sent you a message prior to booking, told you about the wedding, and asked if you had a problem with it. If I were a jerk, I wouldn't have told you about the wedding. But either way, I would have noticed that you're conscientious about it.
However, as others have said, you've chosen to host during the pandemic. I think that if you don't feel uncomfortable with her being in the apartment, which it doesn't sound like, then the ethical thing to do is to take on the inconvenience and leave for a week, rather than put the inconvenience on her to go to all the effort she'll need to. But I think you should also make sure she's okay staying there alone, she might not be, she might have intentionally chosen to stay in the home of another woman to feel safe.