General

Yeah, getting to very high weights comes with consequences which people need to be aware of before they decide to gain. Just because people wish that it were otherwise does not mean that the laws of physics no longer apply. I really don't see this as discrimination but as TheMarshmallow said, they really should have given her a refund.

Not sure about the legality of denying her services she's paid for, but it's certainly bad business.

And I bet she'd win if she took it to small claims court.