I'm planning to steer my mother-in-law to the expert ski slope because she's a novice.
That's a cruel prank. Are you trying to get her injured?
It's not cruel if she deserves to get hurt on the slopes which she does for being a real bitch.
Leave your mother in law alone and let her ski where she wants to. You are endangering the lives of others and are acting recklessly. You need to seek counseling and see a psychiatrist,
You are the one who needs therapy for suggesting that my mother-in-law deserves respect.
By putting your mother-in-law on a slope past her skill level, you are knowingly putting her in danger. Your family will be very upset by this action and might just disown you if you are not careful.