my girlfriend's mom is also an addict and when coral was a baby/kid/toddler/whatever, her mom would smoke crack around her too. seeing as how once an addict, always an addict; i've learned a lot about how drugs affect lives. so in other words, this is sort of "first hand experience"
- Do not leave the situation. make sure it is attended to. especially if your friend has younger siblings in the house, because they're very impressionable.
- Don't call the police either. While your friend's mother is an addict, i'm positive your friend still loves her no matter what she says. aside from that, if she has no family at all or nobody who could claim her, she will end up in foster care, and foster care really fucks up a kid (at least in movies, but it makes sense.) think about it; the government pays people who take in foster children, so a lot of people are in it to get paid and don't give a shit about the children.
Now if you're thinking "yes, but she does have family who could take her",
- You still shouldn't phone the police. Coral was lucky to have a grandmother who eventually saw how bad her living conditions were and adopted her. Her mother couldn't refuse, because if she did refuse, her grandmother could just as easily phone the police and have her taken away into the unknown. In abundance to this, her grandmother used Coral as something to work for to inspire Coral's mother to get clean.
don't phone the cops, see if there's family/somebody close to take your friend.