I am so very sorry. I can't advice you on what to do in your situation. I'd not live with user of illegal substance. Or any addict actually (I lived with alcoholic, never again). But I can't tell you what to do. My heart breaks for you. It's so sad, isn't it.

Living with alcoholic I was constantly one foot out. If you feel one foot out but don't intend to leave, spend that time getting your affairs in order and work on bettering yourself as you can't change her.

I know you live on reservation, are there any services for addicts?