Not new to the thread or subject. She was working as an escort, that means she had a driver and at least one call operator. So multiple people would have known where she was, and the guy who hired her would have been well aware of that if this is what he does. No serial killer would do the deed in their own home knowing that. And what serial killer does their dumping in their own immediate neighborhood?
It is not unusual for low end "escorts" to be on drugs/liquor, especially if they were going to "party". A lot of those women have chemical dependencies, which tends to be an expensive life style, and that is a major reason why they choose to earn a living that way. Having a bad trip and going psychotic might not be something that would happen to you but it is entirely believable in this situation.
The fact remains that she called 911 unmolested for a length of time, left the house on her own and was out in the dark. Her driver was running around looking for her, so obviously he knew that she had freaked out and bolted. It is highly improbable that one of the people involved in this would have killed her because there would be so many loose ends with other people who knew stuff or saw her. Killing her and leaving the body so close, when you know people are going to go looking and consequently might just find the other 10 or so bodies you have stashed away seems exceedingly stupid. It would have been far less risk to simply let her get away.
All the evidence we know of from that night suggests a drug induced psychotic episode followed by an OD. The simplest explanation is usually the right one.
1)No, there was no "call operator." SHE hired the driver herself. She worked for herself and advertised on Craigslist and I believe backpage.com or whatever that other one is called.
2) If you look at it in the most facile way, yes, it doesn't make sense that a SK would call someone to their house & do them in. But who says that's what happened? There are a bazillion other possibilities, which is why so many people are puzzled by this. For example - if, hypothetically, she did in fact end up a victim of the SK and the client was either involved or the SK (and I'm not saying he is, I'm furnishing this as an example of how there could be many other possibilities) who's to say the SK brought her there with the intention of making her a victim? Maybe he didn't, but she saw or found something out or something unexpected happened while she was there that "necessitated" his getting rid of her? That's just one possibility, but there are others, including the possibility that the client had nothing to do with it but someone else did (and don't ask me to go into how that might go down...that's why I suggested going back and reading the myriad of plausible ideas on this thread.)
3) What serial killer does their dumping in their own neighbourhood?! It's a known fact that SK's often like to have their victims nearby, as they get a kick out of passing by them or be able to see where they are, etc. The other victims were close enough for that but not so close as to be suspect (if Shannan hadn't thrown a wrench into the whole thing.) As for Shannan's remains - since she disappeared around there, it would make sense for the SK to let her be found there. If that is in fact true, it was smart, because it has put doubt into some people's minds as to whether or not she was a victim.
4) She may very well have been on drugs/doing drugs/ whatever, but that doesn't preclude her being genuinely in danger. That's what's so irritating to me - yes, obviously is someone is one drugs you might take a harder look at their claims, but it doesn't automatically stand to follow that whatever they say is unreliable, and IMO to automatically make that judgement is not only unfair, but foolish. Again, the issue of her state of mind has been exhaustively discussed in these threads and everything you are saying has been said before and a ton of counter-opinions and ideas furnished - that's why I suggested taking another read.
I could go on with the rest of your post but it's exhausting. I didn't write what I wrote to criticize you, I was honestly suggesting you read back because all of this has been discussed to no end and there are many, many alternative answers/ideas and credible suggestions to the questions you post that have been put out there before. I'm just saying it isn't that cut and dry and if you are really interested in finding out why and if that's true, there's a wealth of information on the previous threads.