I doubt the weather explains it. Mine love storms, it brings the bugs in to them.It was supposed to storm today and did get a little bit cloudy and dark, during the day. It stormed during the night but I brought my chicken inside the house. But Fluffy was acting like that during the day when it was sunny. If it is hormones, what does this change mean?
When they mature and the estrogen surges, they can act a little weird before egg is laid for the day. They can be fussy, finicky like teenagers.
But the grass is always greener, and maybe she sees something she wants to explore?
Don't know how tall your fence is, but if you have concerns she may go over, add something to increase the height even temporarily til this phase passes. Someone on another thread added garden bamboo on top of their fence and it worked for them.