The Garage Sale
If not for the garage sale the shooter would have needed a back up plan. Why would the couple wait until the last minute to decide to have the Garage Sale? Why not have it on SAT when EB had the day off from work? She had already packed her luggage for the FL trip. Waiting until SAT would provide for the best possible outcome in profits from sales to occur. People would be arriving early to get the best bargains possible. (That could pose a problem for the shooter.)
Apparently, Elizabeth was a noble employee who didn't hesitate to ask for FRI off while also taking time off the next week for the Orlando, FL trip to begin on SUN in celebration of their 5th wedding anniversary on FEB 1.
If not for the garage sale, Elizabeth would not have been outdoors getting items ready for the sale. While I cannot be certain of the temperature in Tomball, TX, the temps in Houston were quite chilly.
When the truck first drove past her home at 2am, it was 39 degrees F.
When Elizabeth dashed to Starbucks at 6:08am, it was 38 degrees F.
Between 06:17:00 - 6:47:00 AM, she and SB set up items to sale. It's 38 degrees or cooler.
When Elizabeth is shot at 6:52am, it was 35 degrees F.
When Elizabeth is boarded onto LifeFlight at 7:21am, it was 35 degrees F.
When Sergio returns to the home at 7:52am, one hour after his wife was shot, it was 38 degrees F.
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Houston, TX Weather History | Weather Underground
How many signs and where did the couple place the signs in their neighborhood? It's difficult to surmise or reconcile that someone creeping the neighborhood at 2am saw one of the GS signs and decided it'd be a perfect time for Elizabeth to die.
Finally,
cui bono? Who was to benefit or profit from the murder of Elizabeth Baraza?