She’s still slim (and always has been) but it’s obvious that she’s trying to overcompensate for her figure changing after having kids, she’s desperate to remind us all that she’s small.
Except she’s literally squeezing herself in to a lot of stuff. She had one coat recently that was so tight on the arms it was like she couldn’t even bend them properly!! Just buy a bigger size hun, contrary to what you and your fatphobe sister think, the world doesn’t end once you start buying clothes bigger than a size 12! You might enjoy it and actually be able to breathe or eat in them.