Girls, is my girlfriend overreacting by flipping out at me for asking her to hold her stomach in for a photo?

Okay recently my girlfriend wore an outfit that showed her stomach and we were taking a photo together and after we took the photo I asked her that if she is going to wear that outfit again or an outfit like that if she would “hold her stomach in” and she flipped out at me and got super mad and started crying. Now the reason I asked he to do that was recently she gained like 15 pounds and I don’t want people in photos to notice her weight gain.
Girls, is my girlfriend overreacting by flipping out at me for asking her to hold her stomach in for a photo?
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