Marle,
IMHO I would wait till she returns and if she still wants to meet I would go, and while going and there I would repeat over and over,
God grant me the serenity
To accept the things I cannot change,
Courage to change the things I can,
And the wisdom to know the difference.
I would pick a park or another place other than where she is living, a neutral setting would make it easier for both of you.
You reached out she reached back, I would say that just might be a sign. She's starting to try and get clean, has that happened before?