Still talking lights eh?
Someone here (sorry I wish I could remember who cause it was quite cute and descriptive) talked about a son getting up in the middle of the night to tinkle and leaving lights on.
DB could have turned off lights and son when leaving her bed on way to his and presumably the bathroom (probably what got him up) turned some on and that would have been after SB went to bed. Hence lights on that she didn't leave on.
I wish Dr. Phil had asked....what was your sons and SB's daughter doing from 6:30 until 10:30 and if they went to bed with you at 10:30 and their normal bedtime is 8 p.m. (what she said) and it's a school night....were they up 2 1/2 hours past their bedtime or crashed out asleep on a living room couch or what?
Somehow Lisa left the house that night or early morning. How and when did that happen...still not seeing what lights were on or weren't has to tell us anything that answers those questions.
I don't see it either. And I think it is all a misremembering, the way it is worded, people's perceptions, etc.
Annnnnd, since you brought up my story about the kids tinkling and leaving the lights on, here is another story. LOL (I got sooo many stories

)
A few years ago, before we bought our current house, we lived in an old house that had lots of ways for "creatures" to get in. Mice, birds, etc.
One time in the middle of the night (dont recall the exact time) I was sleeping soundly in my own bed, when all of a sudden I was shocked out of my nice sleep by my husband flipping on the overhead light and yelling at me from the doorway "MM! Get out of there right now! There's a bat in the room!" Well needless to say I was only half awake, I just kind of stumbled out of the room not even realizing he said there was a bat, I just knew he was yelling for me to get out. ( And yes, my oh so manly hubby was yelling this from the hallway. Thanks, hon.)
So after a bit of commotion, I managed to get the bat out using a broom and dustpan, and I put him outside where he belonged.
The next day hubby and I were discussing the incident, and I said something along the lines of "Well thanks for blinding me out of a sound sleep by turning on the light and yelling at me." And his response was "What are you talking about? I didn't turn the light on, I just yelled for you to get out of the room." I insisted he HAD turned the light on, I remembered it because it woke me up, the light hurt my eyes. We went back and forth on it for a while, I was certain I was right. But then we just dropped it, wasn't a big deal anyways.
So about a week later, I was walkling into my bedroom one day, when all of a sudden I just, well, remembered. My husband HADN'T turned on the light, he just yelled. I turned on the light after I ran out of the room and then went back in to get the bat out. What made me have this recollection I don't know. But the week before I was sure I was right, but I wasn't.
Anyhow, I used this long boring story to just show that sometimes people remember things differently, or they remember them later. Maybe DB?JI turned on different lights when they initially were running around that morning, maybe JI thought they were on, maybe DB thought they weren't. Who knows. I think it is TOO exact of a detail to ever get correct, what lights were on, which ones weren't.