Chill Spa Availability

[Boardwalk Family123]

Don't know what to do. DD wants a Chill Spa session and the one day that works really well is also a Port Day. She will want to go on the Port Adventure if she can't get a time at the Chill Spa, but we can't book the Chill Spa until the day we get on board, and that is past the time I would need to cancel the Port Adventure. Shouldn't stress over the spa appointment, but I assume should be pretty easy getting a chill spa appointment on a port day? 7 day cruise. Thanks!