I think Ash would argue that she is building muscle and that is why she appears bigger...no, that is not how it works but we know there would be a justification. Just like it’s trolls fat shaming if size/weight is mentioned.
I think as a lot of us think, Ash is not dressing for her size. I have given up with being a certain size/label...I vary from a 10-18 in different shops. Just find what is comfortable, dress for your shape...if a belt works, if something elongates your torso, if a high waist offers more support...embrace it.
It’s sad that for a girl so young, as a mother/aunt to young girls Ash comes across as so insecure.