It sounds like the airlines did what they could to accommodate them. The fact that a fire crew had to assist in getting her out of the wheel chair and into the seat (and failed after 30 mins of trying) shows that this is an extraordinary circumstance.

I put a lot of this on the passenger and the husband though. First, they knew about the medical condition and need for treatment and chose to travel out of the country. They also chose to stay in a country in which they did not trust the medical care. Finally, they were willing to drive to Prague to try to get on another flight. Instead, they could have driven to Vienna or Munich for medical care.