Aitah for calling my mom fat

I (18f) have gained a lot of weight. In the past 2 years I went from 48 kg to 66kg (i am 172 cm tall). I used to be really underweight and it affected my health. My mom always pointed out that I was extremely skinny and that I should eat more. However, now that I am not as skinny as I used to be she is always pointing out my arms or legs or even makes fun of the fact that when I sit down my belly is showing a little. When I tell her that these comments are rude she begins to tell me how she never said I was fat. I know she didn’t straight up tell me that but the way she acts is much worse. She even makes weird faces at me when she sees me in clothes that no longer fit (she is expecting me, a 18 yo to fit in clothes I wore at 15) One day, I told her that I really wanted to lose some weight and she told me that I never do because I don’t cook healthy meals and that if I keep this up I’m going to get even fatter. One thing led to another and we ended up in a fight. The thing is that my mom is extremely fat to the point that she has problems walking for a long period of time (she always eats unhealty food and never exercises). I told her that she should listen to her own advice and shouldn’t comment on my body when she is that fat.