After kundli revelation perhaps. Kaali will get to know that vishwa has not informed yug's family of the kundli really as he claimed. But i don't see her confessing at all any time soon.
I was thinking about this spoiler - may be too much. I am not sure it fits with the current story line and other spoilers. When will this accident/confession take place - after Aryan is exposed or when Dadi will find out about kundi or before? How will it affect these other spoilers.