I find this very odd. In my experience, when young people stay in hotels in the city that they live in sometimes it's because they are homeless, and sometimes they are on drug binges. Although usually they are more on the motel side of things. I'm not implying this is the case here but it seems odd that she wouldn't have friends to stay with. Or perhaps she was too embarrassed to ask. I just find it very strange.
The first explanation that came to my mind for staying in a hotel in a city you'd otherwise have places to crash (friends couches, family homes, her own dorm room) would be for in calls.
In/out calls is a term generally used by escort services in their ads. Meaning: the escort is able to go "out" to your home or hotel, or she offers her services "in" her home or hotel room.
There is absolutely nothing to suggest SW was providing escort services. Though, if she had, it would be an important avenue for her family to look into, as foul play becomes even more of a reality.
But there's also no reason she should've had a burner phone, so it begs the question of who she was contacting using a phone that for all intents and purposes, "doesn't exist".
Surely, they've checked all security footage from the hotel by now...Would be curious to see if she checked in alone, or arrived with anyone else. If she made/received any calls in her room, how she paid for her hotel stay. What time she checked in/out of the hotel. If she left any of her belongings in the room etc.
This is of course, a stretch, even for me, as I believe she succumbed to depression on the GGB that morning. Syd was a high achiever struggling with depression and part of a family who appears very involved with their outward appearance, status and reputation. I know what it's like to struggle with your mental health, while having your family more concerned with how this makes them look and feeling sorry for themselves about "where they went wrong" vs how they could've helped and supported their daughter through mental illness in the first place.
MOO.