I've seen a lot of times people have criticised crackbun for not stopping beck beck from eating.
My sister is a similar size to becki, but much taller (5ft 10 and size 28-30). She absolutely has a binge eating disorder and secret eats. Growing up my mum would make us all the same food, but my sister would spend all her pocket money on sweets and crisps etc, she would steal any food we bought for ourself, she would sneak downstairs when we were sleeping and make herself food or raid the cupboards. It got to the point my mum locked all the cupboards that had food in. My mum was constantly on at my sister about her weight, the health issues and it just made my sister eat more as she was comfort eating. Until they acknowledge they have a problem and decide they want to do something about it and reach out to whatever services are avaliable for help and support, there's not much anyone can do. As callous as it sounds, I just let my sister get on with it now. I don't discuss her food with her at all.
I suspect that's what crackbun is doing with beck beck, she knows she can't do anything to stop her so just leaves the issue alone