Some thoughts based on the current information we have (for the purposes of this post I am going to assume that the information we have is accurate, which it very well might not be):
Who was she waiting for while in the bar? Why did they not show up?
This part is strange to me. She went to a bar and
waited there alone for around 40 minutes, presumably to meet up with someone. If was planning on meeting someone at a certain time and they weren't already there when I arrived, I would text/call them. I likely wouldn't stick around for 40 minutes without getting some assurance that they were in fact on their way (i.e., a text saying something along the lines of "oh, my train was delayed so I am going to be a few minutes late).
Maybe it is just a coincidence (and it very well might be), but I find it a bit weird that she was ghosted by the person she was supposed to meet up with right before she was murdered. This is just speculation, so take it with a grain of salt, but perhaps something (or someone) was going on in the house at the time and the meet-up at the bar was a ruse to keep her out of the house, and the person she was supposed to meet never planned on showing up? Maybe she walked in on something and was killed as a result?
Why did the killer move her to the basement only to take her upstairs again and take her body out of the house?
Allegedly she was killed on the first floor of the house, which makes me think she happened to walk in on something/someone when she returned home. But if there is already blood all over the first floor (as I'm assuming would be the case given the brutality of the attack), why move her to the basement? Why not just leave her body on the first floor?
Perhaps the killer moved the body to the basement with the intention of leaving it down there but then decided against it for whatever reason? The moving of the body to the basement coupled with the eventual removal of the body from the house makes no logical sense, which leads me to believe there is a level of immaturity to the killer. The threatening text being
sent after the body was moved makes it seem like an afterthought, as if to make a disorganized, passionate murder appear cold and calculated.