how do i find a specific sitter?

Since you've spoken with her, have her send you a link to her profile. There is no way to search by name on Rover. Sometimes a Google search will work if you use the proper keywords. (sitter's first name and last name initial, city, the word 'Rover'). If neither of these methods work, then your only recourse is to contact Rover Customer Support at [Edit: Rover’s contact options have changed. Visit the Rover Help Center at https://support.rover.com/ to find the phone number, help articles, or chat with the team].