I'm sorry, but you misunderstand healthcare in EU memberstates, it's not like you can just move around from one country to another to get healthcare at the level you want it, the default is that citizens go to clinics in their respective member states unless a particular expertise is not available or you happen to be visiting a memberstate when you get ill.

When you're a resident for instance or holidaying you get some choice in the matter because of your location but if I were to get ill tomorrow I could not 'move to a hospital in a country of my choosing' and the same goes for mental hospitals.

In most EU countries people can be placed in a psychiatric facility against their will if they are deemed to be a danger to themselves or others. Paranoid schizophrenics are probably the most well known group who are likely to end up involuntarily committed, but there are plenty of others.

Once you have been committed against your will, you have to convince either a psychiatrist or a medical tribunal that you are no longer a public health risk. You are not free to just move to another facility or country.

Not saying that's what happened in this case, but the wording of the OP title, and from reading the translated article, it seems quite possible.