When I first read about this, my spidey senses were tingling too. It seemed suspicious, only because this all happened in an airport, the person was a journalist, it was in Turkey, and the official line is "suicide". Suspicious right away.
Turkey is an "interesting" place right now with lots of different elements going on. Honestly, you probably don't want to be there unless you have legitimate reason being there (she had, she's a journalist). But it reminds me of what Lebanon was like back in the day, where because of its close proximity to all the hot-bed mid-east war zones, and proxy war conflicts, and issues with regional stability that is brewing, is full of security services from all national stripes working there. I'm guessing every other foreigner of Turkey probably works in the security services of some nation. As everybody knows by now, Turkey, because of geographic location as a neighbor of Syria and as a so called allied friendly state to the west, is also being used as a transit point for would-be terrorists with western passports that want to travel to the war zone (because technically westerners shouldn't have a problem traveling to an allied country on paper, or at least this was happening until the recent paradigm shift from the Russian air campaign that is a game changer for sure regarding their motivations to travel to Syria). And even though Turkey is seen as an "ally" to the West with an apparently western friendly 'secular' government on the outset, it is important to note the political shifts and unrest seemingly brewing underneath in the region, due to the intrinsic hardline religious makeup of the population, wherein such west-friendly allegiance of this "secular" Turkey is honestly a questionable long term viability from the way things are developing. Basically, look at the history of Iran - Turkey reminds me of what Iran was like before the Iranian revolution. Overall, I would say unless one was a journalist, works in the security services, or had family there, Turkey is probably not a good travel destination.
Regarding this case, wasn't there indication she had a history with depression and was once prescribed psych meds (Prozac)? It is possible it was suicide if she had a history with depression.
That being said, she is a journalist. Brainstorming on the more sinister possibilities: It is well known that many journalists covering war zones also do work for the security services. So is this perhaps related to something with her other career (if she was indeed in the security services)? You can never rule that out. If she wasn't, and was only a straight up journalist, well, its not the first time a journalist got 'silenced' because of something unpopular that they are working on that they want to publish. She also leads other extracurricular roles besides her role as a journalist - so could it be related to conflicts caused with those activities?
I guess we will never know. To me, this is suspicious. However, there are too many variables for anyone to figure out the real truth. However, my profile of someone in her position with a history of depression, would not have ended their life in a public area like that. I think someone in her profile would do so in private. So to me, it is suspicious.