a killer??? I hope not

The worst for me is that she is no longer in control of her account and someone else it is. Don't be dramatic.....
there are only 2 situations in your case:
1) You are the owner of the account
or
2) You control an account which belongs to another person and, most likely, she is not aware.
But let's think positive! If you opened the claim with the Arbitrator we should have a contact soon before we will have to open a case with the Police to investigate the issue.
In this case, because you'll have to provide docs proving you are the real owner, we will quickly resolve the issue. We will have what we are looking for and you'll have your funds released. On this you can be sure.
btw, the arbitrator must reply to you in 72 hours from the moment you opened the claim in order to tell you if they accepted the claim. Did you receive the confirmation mail or, also this information is top secret to know.....?
Thank you!
edit: yes, I confirm that the ODR was opened with the same name we do have on the account. However, in opening a claim with the ODR, the OP does not have to provide docs. Also, I confirmed the Euro amount the OP is claiming making it official.