They may cover it in certain circumstances, but the patient needs try (and really try) literally everything else first.
It would be considered a cosmetic procedure, unless proven that it is the only option. As far as I know.
Ontario has excellent mental health resources, but the person needs to want the help, and want to change their life.
It is only covered if you have multiple health issues caused by your obesity. A doctor has to make a rather complex referral to the Bariatric Network. This referral must list all of your health issues related to being obese. It also has to indicate all the other methods you have tried first.
Then you go through a lengthy screening process, at which point they can still refuse you, even after you have been attending all the appointments. You also have to lose weight to show that you can maintain a somewhat healthy diet.
I know of a case where someone did everything they were supposed to and got rejected after a year because they had a history of smoking (even though at the time they had quit).
Its not a given just because you get a referral. Oh and also if you miss an appointment, you are kicked off the list. They aren't there to play games. Either you want to lose the weight or you don't. No excuses. You also have to go through psychiatric assessments to show you can mentally handle all the changes that come with excessive weightloss.
On another note; mental health is covered under OHIP, however only psychiatry is covered, not psychotherapy or therapy in general.
It can take up to a year to see a psychiatrist, unless you go to "psych emerg" and get seen by the crisis team.
Excessive cheese consumption does not qualify as a crisis and she would be told to get her doctor to make a referral to psychiatry and she would have to wait like everyone else.
TLDR: Chantal is a psychotic cunt, and the Ontario government will not pay for her WLS.