I sent another email and got the automatic reply. So at least something makes sense. Even if it apparently also should have been triggered by the first email, and it says that she was back yesterday. So not perfect but i am feeling less lost and alone because at least I got some proof of her presence, so it brought her back into the existing world, which is a big relief.
Thank you for your support. (I guess I will talk about it with her once I/she will be back)