It looks like those pleas for freedom didn't work and the liars aren't getting back into the dollhouse, so they are spending the night in the yard with their pretty, mucky dresses and each other. I'm sure their conversation will be riveting.
I think we can agree that when you're locked outside in the freezing cold not knowing what peril you'll face next, you may have the occasional mood swing. Or maybe they are just sick of Mona talking BS.
Looking at the ground, the liars contemplate how they got to this point in life. It sure looks like they could be debating how to start a fire to get warm before having to rely on some old-fashioned body heat.