Jay,
I have no experience in this area at all. This is an outrage!
Do you have an attorney you can call to help bail her out to the comfort of her own bed where she belongs?
While I was going through treatment, I drove myself to my appointments and I did drive under the influence a couple of times. One afternoon, I actually "bumped" a few cars on the way home with just a whisper of my bumper. Lucky for me it was not worse. I don't consider it a criminal act per se, just a lapse in better judgement. When I did get home, I stumbled and hit my poor noggin on a window sill and ended up with a big black eye. I was sick, Jay. Sick of cancer, sick of chemos and radiation but not not a drug addict. I can see how an outsider might consider that there was some abuse going on. I don't think there was. Now, I seldom rely on any mood altering drugs to get me by.
As for the amount of pills she has been taking... Her doctor needs to be alerted. It sounds as if she is reaching for the first thing that will give her an escape from the mental hell of being diagnosed with lung cancer. I can completely relate. Her doctor needs to be made aware of her behavior. He/she may want to add a tranquilizer to her arsenal. This may take the edge of for her and allow her to function better. She may need an antidepressant Rx. Most of us do, I think. Also, ask regarding a support system for her at her treatment center. Often there will be someone with whom she may be able to work through her feelings. Everyone needs an understanding ear. Be gentle with her. This is her first time down this road too.
This is a first that I can remember here, Jay.
Cindi o'h