Here's the actual response from the FAA, not the "interpretation" by the various news agencies:
"On Wednesday evening, an air traffic controller at the Las Vegas tower became incapacitated while on duty. The FAA is deeply concerned by the incident, is thoroughly investigating what occurred, and is taking immediate steps to modify its overnight shift staffing policies. No safety events occurred during this incident. The controller is currently restricted from working air traffic."
Notice the word "current." Not "no longer employed" or "fired." That's from the FAA.gov website under news and updates. She may have had a non-medical issue such as drugs or alcohol, but as far as I can see from official sources, she is currently on administrative leave only.