Well welcome back; glad to have you. Can't say whether to let her stay with you for a couple week or not - though a fast urine test might help you decide.
I can't imagine giving up on my 19 y/o AD either. I have some rules we dont' break (she can't live here or stay here until she's 30 days clean, she can't 'borrow' money...) and the rest is Ad Lib.
keep us in the loop, and do what you think is best.