In my opinion the teori of Marijke fallen into a river is weakening. Apparently no items belonging to her have been found in the rivers. The rivers have gone big since she disappeared, but still.... no sign.
The teori of an accident on a glacier or an injury that made her unable to move is strengthening. For that matter I can remember an incident I was involved in some years ago. We were some friends going to Falketind in Western part of Jotunheimen. This was late summer. At Andrevannet (a lake) we met two people who had given up their plan to climb the peak. We asked if one of them could take a photo, and of course, he took the camera, backed a little bit, got one of his feet wedged between two small rocks, fell back and broke his ankcle. He was unable to move whatsoever, had great pain and fear. We gave him some painkillers, put him in a good position and provided him with warm clothes. Half an hour later he was able to calm down and clear his mind. Five hours later he was under the surgeons knife and drill at Lillehammer hospital. Of course there were no connection to the mobile telephone network in this area, we had to walk for more than one hour to get in contact with the rescue headquarter.
If you are alone off the beaten track, out of range of telephone network, an injury that makes you immobile put you in a very serious situation.
According to the press releases, I think the leader of the search operations is doing everything right.