Is my client still going to book with me even after she confirmed she will but hasn't accepted the pending invitation yet?

She may have gotten busy, many not have the money right now to pay,or she decided to use a different sitter. The only way to know is by asking her. I would shoot her a message, reminding her to make sure she approves her pet stay. Reminding her that in order to reserve your time with her pups, the reservation needs to be finalized. See if she has any last minute questions on conceens?