Actually aish is not the female lead. She is the parallel lead. In actual on itv there is always only one male lead and one female lead who are referred to as the lead pair, and most often they will have 1 character whose only purpose in the story is to be the third wheel in the main couple's love story who is referred to as parallel lead.
Star plus seems to be clear that Sai is female lead, that is for sure.
Only top 3 show female leads promoted it - actresses who play Anupama, Imli and Sai in 3 seperate videos.
If Pakhi was a lead, there would have been one made with her as well or jointly promoted with Sai.
Ab sawal yeh hain ki ML hai is show me ya nahi?
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