NRTFT (sorry) but this reminds me of my own DGM who was (god rest her soul, but she was!) a busy body who was overly judgmental about many things, but in particular other women's weight. She considered anyone who was over a size 10 "a pig".
I'm small in both height and build. I've never weighed much. Have mainly been a size 8 since puberty, but I have fluctuated occasionally between a size 6 - 10.
I once reached a size 10 and whilst staying with my DGM, in front of my DP, she kept saying things like "men don't like fat women you know!".... "If you carry on like this he'll leave you!".... "Tell her Fresco's DP, men don't like fat do they!" and then served me up the tiniest portions of food, while DP got mountains.
I remember our morning before a long journey back home. DP got a juicy big bacon, sausage and egg butty all cooked in a frying pan on a giant white bap.
I got just two rashers of bacon, with the rind cut off and cooked in the microwave. No bap. Just two small bacon medallions blitzed in the microwave because "you don't want to lose him do you!"
I refused to stay with her ever again. I loved her dearly but it was so fucking rude. I'll eat what I want. I'll weigh what I want.
I looked back and realised all those times I hit a size 6 was when she'd been at me with the fat jibes if she though my weight was "going too far".
I'm a size 10 now. I often look at myself and think "If DGM was still alive she'd hate me like this" but DP is now my DH and he's still a randy bleeder who shows no signs of finding me unattractive, fat or leaving me for a waif.