And let me throw out one other thought that frankly just occurred to me.
Everyone assumes, I believe, that whoever came to the door, came via automobile, van or other motorized vehicle. Why wouldn't it be equally possible that someone walked to the door; someone who lived nearby the home, perhaps walking a dog and they knew one another well? He was trusted and allowed in the house.
Since the paint fumes were obvious it may have been suggested that they go somewhere, perhaps to George's down the street and have a coffee and light meal as she was working off the day's activities; she would have been "wound up" and receptive to a change after working hard on the furniture and would have welcomed a chance to get out of the house. Since the other individual did not have a car, it would have been obvious that it would be her car that would be taken as George's is about a mile or slightly less north of her home on Glenstone. As they left the other dog along with Sherrill's Yorkie were put into the backyard through the small doggy door. My recollection is that it was reported to have been heard at about 1:30 AM that morning a full hour and 15 minutes before the girls would have possibly arrived there.
A couple of things I will state from personal knowledge:
1) I have a more less complete list of her clients. It numbers some 221 names and include mostly women who would ordinarily be expected to go to her. In addition to those 221 names, there are two other individuals who went to her; a clerk who worked near to my office and my own boss. I knew but one of the clients in addition to my own co-workers. At that time, I believe her salon was on the mezzanine level of the now defunct Heer's department store. There were some botique shops there near the coffee bar where many of us congregated during our morning break. I have no recollection of seeing her or the salon if that is where it was at that time. It is always possible her clients followed her to her new location.
Many, many times I asked the clerk if she noticed anything odd in that she went to Sherrill just three days before she went missing. She said she noticed nothing and that they mainly discussed their respective daughter's graduations. I asked her many time and her recollection never varied.
The other thing is that the one time I called to the police station to offer my services I was connected to a certain officer who discussed the case with me. He asked me my interest in the case and I explained my background and believed I could be a good new set of eyes and see what might have been overlooked. I never could understand why it was said there wasn't information to go forward on the case. It simply didn't make any sense and still doesn't.
In any event, he told me something that wasn't generally known and perhaps he should not have told me this but it was that a key to the side door was missing from her keychain. Another persons familiar with the family said it was because Suzie was somewhat remiss in locking the side door and due to Sherrill's instance on security she only allowed her to have the key to front door. I'm not really sold on this idea but it may be true. The other thing that has been alleged is that Sherrill, not once but twice had the locks rekeyed due to security concerns. That would tend to back up that story. I have been told many times I must have lied in that no police officer would have volunteered that information. I have to make a choice of whether to believe my lying ears or what is told to me that I must believe to be true. I choose to trust my "lying ears."
Now before anyone jumps to the notion that one person would be the ideal suspect who walked up to her door, I'm not saying that. There is yet another person I have in mind.
In point of fact, a source close to the investigation itself told me in one of the many thousands of emails and private messages that one of the suspects lived not far away and had a "terrible alibi." So it could have been him. It is also my understanding that he may not have had a car. But that is a wild guess but I seem to have seen that description attached to a strong suspect as well. So it can't be ruled out of hand.
In any event, we know this to be true. She was finishing furniture. There would have been the strong smell of paint, etc., that would make it difficult to sleep comfortably short of opening the windows and running a box fan to move the odor from her bedroom. There is, however, no evidence that I am aware of that any entry came from any of the windows.
Just thought I would throw this out for consideration.
I would also suggest looking at a certain dedicated website devoted exclusively to this case on Proboards. The other is a brilliant analysis on Reddit.