Moms dieing and im going crazy, crying all the time.why? only 15. please advice?

o my mom was an alcholic ever since I was 8. Before that we had the perfct life(although I didn't know my bio dadcauseheabused us) my mom remarried and he had money(lots) and we had big houses partys but soongot involved with hells angels. My mom putmein figure skating ever since I was 2 and I have so many memories of singing in the car, competitions, everything ,vactionsecThen iwe got bankrupt and my mom started escourting I started to re"ize all these changes at 9. She was never home, I found condoms in her bag, then eventually I started seeing bottles of voka being hid around the house. Anyways eventually it led to someone calling social services and we moved away from my step dad as she was saying it was his fault for her drinking, and she develped liver disese and the move didn't stop her from drinking and one night she was really bad and threatened to kill me so I call the childrens help line and 5 minutes later cops were at the door. And took me to a foster home. I was really competitive in figure skating and used to miss school to skate but now I'm forced to stpop cause no one can take me, I've met my half sister 2 years ago (she's from my dads side) and went to her wedding and am now going to become an auntie in 7 months (my sister is 28) and my mom ended up moving back in with my step dad 4 years ago, and I've lived in a foster home ever since and have had visits but my mom would be drunk. She's been to treatment multiple times but failed. And now she's in the hospital , with an ifection in her brain that she contracted from hospital and was in icu 3 months ago but now she's dying of liver failure and her lungs are filling up and doctors said there's no hope of recovery. I miss my mom so much, you all have no idea. I miss the old her with her glow and she was my everything. Now soon ill be alone. It sounds bad, but I never visit her. Whenever I doI tart to cry. I think of the good timesthenthebad take overWhat should I do? I avenoone I'm a girlninsanleydp