Show her affection and compliment her beauty. But do not make direct and specific compliments about her "cute belly" or "larger" areas. She's obviously self-conscious and this is only going to deepen her insecurity. When immersed in a caring, supportive relationship, she might get over it and embrace her body. But there's really nothing you can do about it other than show love.
Just warning you, though; her weight is obviously a hot button for her. I'd lay off it.
When my wife makes comments that she likes her bigger hips, I'll pile on and make my feelings known. But I never bring up her bigger size out of the blue because it could very well be "one of those days" where she's not feeling too pretty and any "compliment" about her size will be received negatively.
6 years