I wouldn't be suprised if her mood was affected by her weight and vice versa. It can be a vicious circle. I've never suffered with a eating disorder but I have suffered major depressive episodes and the worse I feel, the less I eat, the thinner I get, I get in a bad mood because I'm so lacking in nutrients, I feel even worse etc etc. I'm not saying thats what is happening to her because obviously I don't know the slightest about her true life but I'm just saying I know how mental health and Weight can completely spiral.