She is objectively attractive, enough to be a big model and actress despite weak acting and this is territory where your own personal taste can set her from 8/10 to 10/10 but not below. She is mentally ill and johnny is a bit too but not like her obviously and this is what probably attracted one to each other, relatedness in mental struggles.
Its not about gym at that weight, eating properly will easily make massive calorie deficit. Heck at that weight gym is even risky, your body is already working against huge load of fat without any muscle to help.