40yr old pregnat sister

My 40yr old sister who lost all 5 of her kids to cps after going to jail for $2000 in bounced checks and testing positive for heroine and her oldest pregnant daughter (14) tested positive for it too! Found the money and a doctor damn dumb enough to untie her tubes and is now pregnant again........ and she has again tested positive for drugs so they might take this baby at birth.....just WTF i am so so so confused!!!???? What doctor would do this and why would SHE do this i can't I'm just baffled.