Why is my wife's sister like this?

Anonymous
FIRST I wanna start off to say my wife is absolutely beautiful, yes she's overweight but I love big women. HER sister comes back and tries to change everything. My wife says she was jealous of her sister growing up and had to go to therapy cause my wife felt so shitty of herself. Because she modeled and stuff and the constant fat shaming my wife gets from her family is alarming. If my wife wants to lose weight I'll support her, but I think it's shitty for family to point that out. She walked in to get food and my wife's sister told me that I should be trying to get her to lose weight. My wife is 27 if she wants to lose weight that's her business. My wife's sister is always trying to boss her around. Whenever my wife talks she says "well don't say that". No wonder she stays quiet.
What do I do?
Updates
+1 y
It wasn't the fact she was concerned about her weight, it was the fact she told me and not her. My wife has never heard her say "you need to lose weight for your health" she told me to tell her. She never came to her and told her.

She does lots of nice things for us, but with a slap in return. My wife is beautiful and precious in my eyes.
Why is my wife's sister like this?
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