If she's going thru a month's supply of Xanax in two weeks does she cold turkey the next two weeks or buy off the street? If she cold turkeys, sounds like it's more of a psych addiction than physical addiction. A psych addiction can be every bit as debilitating as physical.
At some point she may need to consider inpatient that will provide drug and psych counseling.
At some point she may need to consider inpatient that will provide drug and psych counseling.
Being told you're delusional does not necessarily mean you're mental.