I'm still not so sure what you're doing (running a pool) is legal in the first place. Just because you've been doing it for three years, have a big sign posted about it, and with management's approval, does not in any way whatsoever mean running a pool like this is legal.
So while it's legal to cut this woman out of the pool, it may not be smart to piss her off. She wouldn't be able to sue you for anything, but she sure could report you to the gaming authorities - and if running a pool is illegal, then you'll be up to your neck in legal doo-doo.

