GREAT catch. I dont think we know what phone AW used to call her SIL stating CWW was too sick to watch the grandchild. BUT, you are correct, AW did use CWW's cell on Sat to call JR cell. No doubt she would have glanced on the texts. If CWW is such a technology geek and a heavy cell user, he would have had several texts on his cell from several people and I strongly feel she would have looked at the texts ( I feel most wives would have) (start throwing virtual tomatoes now).Since AW was using CWW' phone (she also called CWW' Son, to tell him CWW was ill and couldn't watch the children, IIRC) wouldn't she have seen the text message from JR at 6:43 am, asking CWW when he's going to pick him up, with CWW' reply of 7:30 am?
Another edit. Once AW knew CWW left his cell at home, I am guessing that threw her for a loop and she immediately snooped his cell whenever she returned home Sat
FWIW, I dont think AW knew JR was going on the trip. She was mad about her not getting to go and was very vocal about the fact. She clearly stated to KM/EM and their houseguest that she was livid w CWW going on a vacation and leaving her home. If AWW was in the pre-planning I don't think she would have been verbalizing these facts. She was livid enough proclaiming known facts I think she would have said something like "He force me to stay home and make money, but yet, he chose JR to be his ride along company"