Hello, welcome to HW, it's lovely to have new members.
I am concerned for your friend. Xanax is one of the most potentially addictive anxiety meds out there and her dosage is not sensible. I was put on xanax when I was in my teens and the dose crept up to 8mg a day. Doctor sanctioned. I came off it by going to a re-hab unit, and it was not easy. I was put back on xanax by a doctor about 6 months ago and I found that it made me feel angry and aggresive. Perhaps this is what your friend feels gives her "energy"???
I am not a health professional but it sounds like she needs to get off the dosage.
She seems to be quite oblivious to the damadge she may be doing to herself. You mention you are both care givers. Is there any way you can get her into a re-hab facility? Drastic I know, but it may save her.
Please, any questions on this you need to discuss, email me.