Well man, I think maybe part of the problem is she JUST goes to school 2 days a week. Leaves too much time to get bored, and eat. Have her get a job, preferably one with some physical activity, sitting at a desk all day won't help much, but possibly some.
Other than that if she's not responding to hints, you may just have to put it a bit more blatently.
If you want her to change your eating habits, you'd better change your own as well, and start heading to the gym.
I'm brutal when it comes to honesty, so take this carefully.
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