Your tough. experiences tell you to let this one go downtoearth. It's so hard when you've spent your life putting the needs of others before yourself. I agree with you, this poor kid needs help, love and support but you aren't in a position to save everyone. It's always been tough for troubled teenagers and children's services usually attempt to find a solution within the family or the community. That's partly based on research that confirms teenagers who go into the care system don't do very well, of course they don't because they usually arrive with all kinds of emotional/psychological and sometimes psychiatric problems.
The other reason is resources. The local authority I worked in 30 plus years ago had various resources for teens, none of them ideal but at least we could always find a bed in an emergency whilst we worked out a better, longer term solution. All the family group homes, small children's homes and many of the older foster carers (who had elastic walls in their houses) are gone now.
None of that is down to you downtoearth - don't beat yourself up, it's time to hang up your rescue outfit 
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