Happened on a flight I was crewing last year as well.
Other crew member knew the FA socially. Was a great shame. Lovelly girl. Purser took a report from another senior FA, talked to her and then the captain.
Relieved from duty during the flight, did the landing home on the jump seat, taken straight to testing and never heard from again.
A great shame and a warning to all. People deal with stress in many different ways. This to me was a cry for help from someone unable to cope with all things Middle East.
I think I'll just head to the fridge for another!