Though I may certainly be the wrong person to go to for friendship advice, I'll attempt to stifle my inconsideration, as you certainly seem to be doing bad enough as it is. In my humble opinion, she definitely needs to be left on the wayside. She's not a good friend for you, let alone anyone else, & perhaps if left alone long enough; she'll realize why. Just because someone is/was your friend does not mean you should have to hold yourself back just because they choose not to better themselves. I hope you're going to do well after this, as I can imagine losing a friend is a rough experience, but it's wholly necessary for both you & her. She can't continue to be enabled by the charade she puts up for everyone & for herself. If anything, you saving yourself is the best thing you could do in the situation. Especially if you feel your child is at stake.