Do you think Nancy saw it coming at the end of Season 5 of Weeds?

Just hooked up Showtime and have watched a marathon of every episode of Weeds. The show is great! I present a question to my fellow Botwin followers....At the climax of season 5 when Shane bashed Pilars head in at the pool do you think Nancy saw it about to happen. All of us at home had Nancy's point of view of Pilar at a close angle but the area that they were in was very open, it was a pool deck. I can't see how Nancy, unless she had a bad case of extreme tunnel vision could not have seen Shane approaching with the croquet mallet. Anyone have any opinions on this

P.S. I laugh everytime Nancy tries to discpline Shane.....the spanking for KILLING someone was priceless..