Is my mother in law stupid or is it just me?

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My mother in law thinks that my 7 year old daughter needs to start wearing a bra. She has no breasts. She isn't heavy or anything like that. She is a typical 7 year old. My mother in law is heavy and says that she had to start wearing a bra in the 4th grade and I guess she thinks that my daughter needs to as well. When she buys my daughter clothes she buys them 2 sizes too big and undwear that is 4 sizes too big. She recently bought her some pants and a skirt and they were size 10's. My daugher wears a 7/8. The pants were too long and baggy and the skirt would barely stay up on her waist. She also wears a size 6/7 underwear and everytime my mother in law buys her undies she gets a size 12! What do you think her deal is? Is she wanting my daughter to be heavy like her? She is about 5'3" and over 200 lbs.