That behavior (submerging) seems to be similar to my guy's at an early age.
Wallace would go into his bowl shortly after eating a screw around going in and out and flushing water all over the cage.
I use a combination of coco just and either bark or cypress so it absorbs some of it.
He's older now and seems less into the submersion.
You may have a hard time if your girl is projected to get big. Perches and ceiling in a very large cage for most hobbyists may not be practical at all.
If I could, I'd have a much larger cage for my guy.
A buddy here, EL-Ziggy has a scrub and an olive amongst his other awesome captives.
I'm sure you and Zig would have a lot to chat about when it comes to scrubs.
Your girl will get a lot larger than my retic, but I'll bet she'll be a lot more mellow.
Again, congrats on the new pickup!