Well obviously the truth is that none of us knows. But one recent event we have to base our record-screech upon is that is exactly what Chris Watts did, the moment they made him view the neighbor's surveillance footage which he didn't know existed, and which clearly showed him loading his truck (with his deceased wife and doomed daughters). He didn't know what he'd see on that, only that it could be very, very bad for him. His swaying was sudden and very nearly out of control, when he became aware of a situation/piece of evidence that could sink him.
This is what we're seeing here, at least that's it, for me. It doesn't necessarily mean anything, but it's a pattern we've seen: otherwise relative calm, then suddenly one event (the fact that the laptop can be tracked) that seems to bring this on. Is it proof she's involved? No, but it does seem to indicate something, to those who've seen at least one similar situation.
I don't have an opinion yet on her involvement, actually, but it certainly does add to the peculiarity pile, for me.