Would like some insite and views regarding mothers who are addicts..

My lil sister is an addict, thief and compulsive liar. Gambling, weed and meth. Shel do anything to get her way or a fix. You must lock doors and possessions away if shes around. She believes wholeheartedly that she can still be a good mother while being on P. Yet no money actually goes to her baby, aka govt benefits, she waits till my mother gets home from work and then shes gone the rest of the night returning in the morning as mum has work. Baby is just 6mnths old and this 'routine' has bn like this since baby was born. She was on P before this too. She refuses any type of mental health help, her addiction is more important. Our family does everything we can to make sure this innocent baby is safe and ok but the times where it is just her and baby is very questionable and worry some. We regularly have to call the cops on her as her behaviour is erratic, loses the plot and not safe to be near any child. I have children myself and the other day she lost it at my 4yr old in one of her addict rants. I was furious. To any of you who are addicts or recovering what do you think? How does family help? Atm all we can do is keep my children away from her and try our best to protect that baby of hers. Cyfs are aware. Her police wrap sheet is long yet nothing is actually being done.