You're beginning to assume the role of a parent and it's not healthy. It's not healthy to guide her consistently in areas where she should be able to guide herself and it's pushing an enabler's role. The relationship is very imbalanced and full of inconsistencies. Why you're with her is anyone's guess and I would take a closer look (I mean this kindly) at why you're attracted to critically flawed individuals like this on such a personal level. It's not fair to yourself (your health, peace of mind), it's not fair to your family and friends who support you and it's not fair to your own employer or employment which may be affected in the long run because you can't focus and you're too tense to do well in your own professional life.
You're waging a very poorly thought out war here and you have a very weak ally. Life is full of painful ups and downs. You should be deciding who you choose with you on your journey and I think you owe it to yourself to choose company that uplifts you and makes you smile more. She really needs to strengthen herself and do some soul searching on what her weaknesses and strengths are. No amount of love is going to help her do that on her own. This is her personal journey. I understand we all go through tough times but I don't think this is just a brief period of difficulty. Her character is showing a lot of flaws and it's ok to believe in someone. It's not ok to allow it to affect you in ways that harm or put you or your other loved ones in danger.