I am sorry one of you can't move. I know how her depression is effecting you. You have to think of yourself sometimes or your will go nuts.
This depression stuff if bad enough can make people act the way your friend is doing. My son had to quit a job in the middle of a recession, and I was so angry I didn't know how to respond. Just how did he think he was going to pay his bills? He took five months off, now is working 60plus hours a week to make up for the whole he got into.
I donot know the answer, to try and lift the spirits of your housemate. I know I have been in some pretty funky moods myself, but never to the point I could not function. I know it is hard to have compassion, but please do try as what she is experiencing is that "bad" to her.
I hope she gets lots of council for the sake of both of you. Ask her kindly to do those things she ignors, give her a hand off the couch and say come on, we got to do this, extend the hand and pull her up! It is much like getting someone who just had surgery to move, when they are still in so much pain. Unless you get up the pain doesn't go away. The key to recoveryis to MOVE!
I will be thinking of you Mbrook, and praying for you to have patience in bad circumstances. I will also pray that your friend keeps getting the help she needs to overcome this depression. ginnie