I was just thinking the same. She won't last long, unless of course Jenn values her "freedom" from motherhood more than if J is affectionate with her.
It's weird to think of the dynamic of how this goes. They board a ride and then grab J to be with them for the camera shots, nanny is awkardly sitting alone during a ride, then they exit the ride and nanny takes J by the hand and these two wander off babbling into the camera. THIS POOR KID. I thought the Tweet that guy made when Jenn was pregnant was dramatic and rude, but now I stand corrected. One day he is going to watch these videos and be totally hurt/upset/confused why he couldn't just spend time with his parents, without a nanny, AND not have it filmed. If the nanny does last a while, he will be TOTALLY attached to her and go through a lot of emotional trauma if they suddenly remove her. If she doesn't and they replace her, he will go through a different emotional rollercoaster of having a new person to connect with after thinking the prior nanny and him were close.