Our first experience with Club Ocean was when our youngest was 2. They do divide by age group, but sometimes combine groups when there are low numbers. We have found supervision to be excellent. Our kids really liked the staff.
They have both open play and supervised activities, sometimes at the same time, and the kids can pick if they want to do the activity, or something else. Supervised activities are on a schedule you'll have, so that can help in figuring out when she might want to go to the club.
You can check in at any time. Parents are not allowed in the play area, but you can peek in at any time to check on her. We've done this, almost always without our son even knowing we came by.