Yes, she's suicidal if in a passive way. She's not going to listen to you because she's detached from reality.

ETA: it sounds like you've been conditioned not to do anything about anything, as modeled by your parents. Unfortunately nothing will change that way. Talking to your mom probably won't accomplish much since I gather you've already tried that a few times. If it were my mom, I'd call emergency services and probably ask to go with her if I had no other avenue to get my own severe depression treated. There's a chance you won't be forgiven but you won't know that until you do something. Your parents will not change anything on their own.

ETA: You could also call ES for just yourself. It won't change your parents but at least you could get started on some sort of treatment plan for yourself. You'll probably have to say you're having suicidal thoughts in order to go to the hospital.