That question is one that keeps coming up, and is stymying.
With the new information from the Sheriff and the media, it does apppear, and IMO, this crime started fast and with gunfire, it stopped dad Jim at the doorway, the 911 call happened, and mom Denise was found closer than Jim to the location of her phone (the one the 911 call was made).
It makes sense on a certain level Jayme would have been asleep when the crime started, but certainly would have been startled awake with all the shooting.
Assuming the shooter knew the 911 call had been made and help was on the way, Jayme may have been taken as a hostage, or a negotiation tool. That’s just a theory to possibly explain why she was taken if, and only if, the motive wasn’t to get her and one (or both parents) was the target. IMO.