Eliotte's phone being found near the hotel (provided that piece of info's correct)-- that's of interest in terms of how this may have happened. The hotel is right on the banks of the river, but if someone were to have fallen into the river, the phone would theoretically be left right near/on the banks. The victim would have to make something of an effort to reach such an area. Why would Eliotte have done that? Without some interceding outside factor, what would prompt her to wander onto hotel grounds at near 3am/4am when she's on her way home? It's definitely possible (maybe her phone battery died and she needed to charge somewhere), but it doesn't seem likely. I mean, hotels are open all night, if she felt a need to move in the direction towards the hotel grounds, I'd guess she'd just walk in & talk to someone at the front desk, which is usually fairly easy to spot, even if it's very dark.
This wasn't Eliotte's first year at this campus, was it? Does anyone know? Because if it was, the odds become astronomically higher in my mind that she perhaps got lost and/or maybe accidentally wandered into a hazardous (in some respect) area.
RIP Eliotte. Condolences to the family, which is experiencing something so horrendous it has to be unimaginable.