Thank you, Panther. She is now safely in a rehab facility, where they are weaning her off the Ativan. I believe you are correct that it triggered a relapse, on top of the sudden death of her brother. She is now getting grief counseling, and definitely knows that taking the drug on top of the drinking was not a good idea. I went to visit her last night. Her spirits are good and she is very appreciative of getting some much-needed counseling.
It's been tricky trying to detach to keep my sanity intact without compromising her safety. Sometimes the path is not so clear. But in the long run, acting on the side of caution is always the prudent thing to do.
Thank you for your thoughts and support.