You can go into your reviews and edit the review with two conditions:
1. It must be within two weeks of the stay
2. The other party can not have left her review yet. Once both parties have left reviews, nobody can edit them. This is to prevent people changeing their reviews in response to a negaitive one.
If you can't change it, I wouldn't worry too much in this case. You can just send her an "oops, sorry" message.