Fantastic, Curryong.
I think the parlour being locked was kind of assumed. I didn't see that there was testimony to back that up. something to look for.
Bridget's window washing bothers me. It's a warm summer day and the windows are probably dusty from the unpaved streets. She scrubs the windows outside witha brush THEN goes in for a dipper to rinse! Think about it. I just washed my car with a hose on a warm day and had to re-wet surfaces because they dried and streaked. My car washing is a little like Bridget & the windows because I don't use detergent. Wet, scrub with towel, etc., rinse then towel dry. Anyway, think how thoise windows would have streaked between the scrucbbng and the dippering. I have always been surprised that Bridget didn't dry the windows with rags (paint stained dresses perhaps

) or newspaper. I'm also surprised she didn't seem to use vinegar in her wash water since Andrew seemed to have a vinegar business.
I'm not sure how many people would have had hoses in that time because for a hose to work there tends to need to be pressure in the system. Water in a hose creates friction so a low pressure system makes it very inefficient.
Somewhere, I think some of Bridget's testimony, says that Andrew had a fellow from the farm wash the upper story windows once or twice a year.
I have found it odd that Bridget didn't see Andrew leave but she could have been in the barn (yes, really, in the barn) getting water or equipment. I do believe she had a migraine that day and vomited as consequence. It doesn't matter a great deal to mention this, but my personal experience with migraine vomiting is that it is projectile & completely disabling for a short period as far as the vomiting goes. There is a mental change at the time. Personally, I would be humiliated if I vomited in front of people due to a sick stomach, yet with migraine I'll just go face down wherever & not care. For me it is always just water as I can't eat with migraine. A bigger point I make though is the mental change~migraine has some similarities to epilepsy~can be overwhelming and she might not have known how long she was indisposed. Once an attack is over, at least for me, there is no residual stomach upset but during the attack it is very disabling.
It is interesting that Lizzie told Bridget to close the blinds/shutters, whatever. (I thought she had said this about the sitting room so need to look at the parlour windows again.) One could wonder if Lizzie had company in the parlour that day. Someone we don't know about. That could make sense of a number of things.
I still think it interesting that the defense didn't make use of the un-entered parlour for suspense at trial. Who knows what could have been in there, at least for the purpose of drama? For some reason they didn't.
Mrs. Churchill testified that Bridget washed windows every couple weeks, twice a month or whatever. People have long thought Abby was cruel to Bridget "making" her wash windows when she was sick. The way she did it wasn't as bad as if she had to polish each one. Where I live that kind of window washing would make calcium stains. I can't imagine it was very efficient at 92 Second Street either. Like I suggested in another place, maybe the parlour windows were unlikely to accumulate coal smoke, fly specks and whatnot inside, so maybe they were seldom washed inside.
Whole thing is curious but I sure enjoyed this thread!
Is all we see or seem but a dream within a dream. ~Edgar Allan Poe