I've been reading here for years and years but just recently joined and post rarely. All 3 of my children have worked in (one still does) the restaurant industry. Some things I learned from experience:
1. Their work schedules dictate their sleep/socializing patterns, whether out and about, online, on their phones, texting, etc. It's not at all uncommon that 3:00 am or even later would seem like a normal time for them, since most of these types of restaurants don't close until midnight or later, especially if they have a bar. A lot of these kids don't even get off of work until after midnight. So meeting someone or going someplace at 3:00 is not uncommon, especially if they are living away from their parents' house.
2. Most of them know or are friends with the servers, etc. from the surrounding restaurants and bars, since they tend to hang out in them when not working.
3. There's always, and I mean always, someone in that crowd who either supplies or knows how to get, shall we say, recreational herbs or medicines. Someone known to all of them by means of frequenting the different establishments, where as an employee or a customer.
4. It's not at all uncommon for them to meet up with someone to take off for someplace else, especially if one of them is going to be a designated driver.
I don't know what happened to HE, but they need to focus on talking to her co-workers and workers in the surrounding/near proximity restaurants. One or some of them know what happened. The timing of her last phone call/text, her car being found where it was, and lack of clues(?) in her apartment are not really unusual for this group of young
people. Personally, I suspect that she probably did meet up with someone for some recreational reason and/or left with them for somewhere else for whatever reason. Especially if her car was parked away from the water so she could see their vehicle approaching. Especially if she thought her car would be safe there until she could retrieve it. It's just their lifestyle. Maybe the landing was just a known midway point for them.