I can't remember what the program is called, but there is a voluntary program (separate from treatment/rehab but often found within the better facilities) that health professionals use in order to regain their licences. A couple of years of monitoring, random UA's, etc.
Hazelden is probably the single biggest place that health professionals go to for treatment (from all over the country), and they're even local to you! <grinning> as in they're in WI and OR... not sure how far distance-wise within the state. They should be able to answer any and all of your friend's q's.
Here's a link to them
http://www.hazelden.org/web/public/adulttxthealthcarepro....
To know ... I know many MANY nurses and doctors (of ALL specialties from NICU to Surgery) that are at various points in their own recovery (aka, brand new and still monitored to decades clean), some "caught" some not. It's a common problem in healthcare. It will probably make getting a job more difficult, but not impossible by any means. Not even impossible to stay in her specialty.