Good point, taxi is yet another possibility. Then again, for all we know, such an intruder could have left with a suitcase and simply walked a few seconds to the metro. Within ten minutes, he’s on the other side of the city.
As for a predator within the building, I don’t think this is a possibility the police would overlook. But if they’ve crossed over into murder, they would still be left with the problem of the body. At some point, they’d have to dispose. Now, such a predator would have to be doing this for the first time. Because if they’ve acted out violently before, they’re almost certainly on record already. And if that were the case, the police are going to see that two and two is four. The in-house theory is possible, yes. But I would bet very, very heavily against this.
As for going to Spain, the weather is good, the food is good, the quality of life is good, prices are very low (comparatively). Spain is the second-most visited country on earth. It has the largest expat population in Europe. Some studies hold it as the second most popular nation for American expats to move to (after Canada). So, just on the face of it, it doesn’t seem odd to me. In Ana’s case, going through a divorce and depression, precisely because it’s far away, it seems logical that she would come here. Plus, she speaks the language. She’s also been here before. Possibly multiple times.
Re: the therapist, I think given the situation, they might possibly share anything concerning in Ana’s case.