I don't no why But I have strong feeling that She is non other than Rimjim's Mom. I think she lied about her husband being dead. Somehow her entery is made me think that she is Rimjim's mom.
or i thought rimjhims mum (someone else not kalu) would be praveens new lady love.. cuz she left her husband because he was not good and she even gave a statement against him when he was wrong.. that means she has good values and just appropriate for thakkar family.. so praveen and rimjhims mum are very likely to get together..