I think at first they didn't have intention to show who the spy is but when they saw we are interested in it they bring this..
Never expected it to be Pakhis mom. I remember someone on the forum said long ago that once Sukor are together villagers are going to be old ones. And I think maybe we are heading to it... I think this is just a start of showing villagers still scared and submissive. And after Bhuka someone related with Pakhi is best represent of villagers.
I didn't expect it to be some one important but I'm surprised why they went with Paakhi's mother and not her father? I think they had a change of plans and so Manju's role ended and changed the spy from a man to a woman.