From what I've read, and the reported timelines and details change more than Riibe's story, so correct me if I'm wrong, but the search operation didn't start until two days later. Littoral currents in that area move west-north-west at 1mph-2mph. Two days later, the body could have easily been 50 to 100 miles away. That is a vast expanse of ocean to try and spot a floating body - especially in seas that were reported to be rough. At this point in time, the chances of finding her are a less than slim.