And JuJu Bean is your real name?
I'm sorry for this woman's family. I'm sure they grieve deeply for her. But there are thousands who did not know her or her backstory. That does not make them or me bullies. 
And it does not change the fact that she lived on the streets of her own choice. She walked away from help, more than once by the sound of it. There are many who have all kinds of mental health issues who do not make that choice. With meds, therapy and family suport they have jobs, homes and make a good life for their selves. 
We don't hear about their "backstory" ether. 
What would have you done JuJu Bean if this kid had come into your home? Would you have let her live with you without ground rules about drugs and alcohol? What were the rules her Mother had in the home that she had so much trouble with? But we don't hear about that part of the "backstory" do we?

Choices have consequences, for her those consequences were deadly. There is nothing any of us can do about that.