Well, one of her kids is obese, and I would call that abuse.
Personally I wouldn’t be so quick to judge on that. 1 out of 3 kids we can see in the photos is overweight, the other two look healthy. There might be something else at play with that one child, which is out of her control, we don’t know that.
For example Hypothyroidism, Cushing syndrome, pco-syndrome or lipedema and several metabolic deficiencies. Then there’s also a plethora of psychological issues that can influence the metabolism and eating habits negatively. Even the social status has an proven effect on the bodyweight.
All we have is a couple of pictures of the child, it’s impossible to tell what is going on.