Idk if my gf is gaining weight or not

She’s been traveling the whole summer and she sent me a pic of herself. She looked a bit bigger than before she left. I haven’t seen her in 3 months and she sends me pics of food almost every day, and it looks to be very rich food as well. Idk if it was the angle of the pic but her face looked a bit bigger idk, someone tell me what i should do and how to approach her and maybe ask about it. I’d also like someone opinion on it, but please be respectful.