Freshmen 15?

I love my girlfriend I have been together with her for 4 years but well she got back from college and it was her freshmen year and she gain some pounds. I feel so bad for asking this but how do I tell her that she is a little heavy. The bad thing is she is small 5 foot 3 so pounds show. she also as bad as this is, she makes fun of other people who gained weight while at college to. so sometimes I'm like baby please look at yourself before you judge other people.

I don't want to be the bad guy but I don't want someone to hurt her first by saying mean things since she is back home and all her friends are coming home to see she for the first time.
Freshmen 15?
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