It has been assumed that robbery was not a motive. But who would know if PART of her jewelry was missing, or anything else unknown. My father had a coin collection. Had someone taken 1/4 of it, my mother would never have known.
I mention this because that would be another reason to go to the bedroom. To steal small, easy to pass valuables. (Watches, wallets, jewelry, these days phones, tablets). Shot because Monique woke up and was shot, Spencer started to get up was wounded, then a final, fatal shot (why he was on the floor).
While it looks like targeted on the surface, I have to leave robbery on the table unless someone knew everything they owned and has accounted for all of it.