How do I rebook a sitter that I booked with, but cancelled?

I booked a sitter for my dog, but needed to modify dates with her. We agreed on the modifications and dates. Before I could modify the times, she cancelled the booking so that I could make the changes and rebook with her. This is the first time I am using this sitter and there is no option on Rover to rebook her or book her at all! How do I access a new booking through Rover and complete the process?