I'm fed up with my ex roomie's depression
Could you explain why you're fed up with her?
She just lies in bed the whole entire day
Its better to be supportive rather than fed up. If you were depressed that is what  you would want. Its just the other way around is all.
She is just depressed because she is fat and ugly.
Insulting someone over their weight isn't going to help them. Why not just look on youtube for better answers to your situation in order to help everyone out.