@jmchampson in that case you don’t have a confirmed sitter so it’s back to the drawing board .
If you link your listing here forum members can give advice on how to make improvements that will attract more applications.
https://forum.trustedhousesitters.com/t/how-to-add-a-listing-or-profile-link-to-your-forum-profile
You can also send a message to the sitter saying that she needs to accept the sit by xx (give a deadline ) meanwhile as you have not heard from her you are looking for alternative sitters .