Am I overreacting?

I’m Mars and I have suffered from anorexia for a year. I’ve recently been doing really well in recovery, I’ve gained the weight back and been eating things I have been scared to eat. Before and during my anorexia I would always compare myself to my sister who eats whatever she wants and is extremely thin. My mother used to make comments about how thin and “amazing” my sister looked and it made me want to look like her.
Anyways tonight at dinner my sister started talking about weight and exercise. My mother kept saying that my sister looks like she exercises a lot and is what a lot of people exercise to look like.
I’m upset because my mother never has and never will say anything like that to me. Even when I was so thin all she talked about was how awful I looked. I’m crying. I will never be enough