She was still on probation so the company doesn't have to give a reason for termination- although the selfie on the jump seat is enough to get her fired anyway. The article is also a little short on detail about how the accident occurred.
The company certainly can treat employees badly but there isn't enough detail in the story (lots of selfies though!) to say they did in this case.
If she wasn't so photogenic (a pilot say!) I wonder if The Sun would have been as interested.