I said it's an exception, OK?

But wouldn't getting fully hypnotized turn the mc into a mind controlled doll and thus limit severely what she can do essentially taking the game play out of the game?

Then you'll just get a slide show of pre-selected pictures.

However if you could hypnotize other people, that's another story. You could have fun with that. Like hypnotizing the teachers for some fun or to give you better grades without studying.

Maybe convince the sister to brake up with her boyfriend for real and become the mc's girlfriend.

Or convince mom to be more affectionate with her daughter.