My mother is addicted to cocaine I don't know what to do?

I'm 17 and I have a mother who is addicted to cocaine. I try and talk to her, never fight with her. I always do the right thing never done a wrong in my life.

I don't know what to do, when I try to talk to her she gets angry and pushes me away. She had an incident recently when she was smoking cocaine and she was cooking with oil, she was so drugged out, the oil splashed onto her face and she just sat there on her bed for hours. How does that happen, unless she was numbed out by the drugs?

She has permanent burns and scars to her face, it’s been such a traumatizing past month. I'm trying to look after her along with school I just can't cope. She's had this problem since I can remember. I remember when me and my brother and sister were at home, we were like 5, she came home obviously smashed and had a fit foaming at the mouth, obviously due to drugs.

She sleeps around, I know this for a fact, she’s still recovering from her burns and she’s already back on the drugs and bad habits. My sister, brother and I can't look after her at all because we're at school all day, and she sneaks away at night.

I try and I try I tell her we care about her and we love her and she needs help, she gets angry will just push me out the room. I cry in front of her but I guess she just doesn't care. Finding her in her room her face looking like it was melted off is traumatizing enough, I don't want to walk in there one day and seeing her dead from an overdose.

Please I don't want her to spiral. I have no clue what to do or who to talk to.