Zoya plotting on her own is an interesting idea too :)
Yep those BTS pics indicate Zoya a little teary which means plotting occurs after Anjana is arrested. I reckon Aditya goes after Zoya once she is shown leaving the house.
They hatch a plan once they unite outiside of the house and out of RV and nani.
But if Zoya has already started plotting then kudos to her, the sherni is back with a bang!