The Salvation Army Rehabs are free and available to her if she chose to go. She didn't.
None of this is your fault, she made some bad choices and has to live with the consequence. Maybe, just maybe, this will be the time she needs to think about her future...yes, it's in jail but she will have time and a clearer mind to figure out what better choices might be.
Don't beat yourself up for taking that phone call, I probably would have taken it too.
Finding meetings for yourself just may be the best gift you ever gave yourself and help you keep your balance through all this.
Hugs