My girlfriend is self-conscious about her weight. WHAT DO?

Her family is telling her that she's been putting on weight. I personally don't care much about it at all but she has been gaining a little bit of weight over the past couple months. I mean she's still beautiful but I don't want her to feel self conscious. So should I take her to do more active things to help her feel good but I don't know she might think I think she's fat and I don't want her to get upset. Just... what should I do? XD
My girlfriend is self-conscious about her weight. WHAT DO?
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