Exactly what I thought. That's y I had asked in the other thread whether she was there in any of the previous seasons.
The previous actress who played Sid's mother had a typical chawl wali look whereas when Aarti stepped in, the mother has become suddenly all glamorous and looks anything but chawl wali lady.
Also, previously Sid's past used to scream illegitimacy. However now they have toned down to just a fatherless child who's father is nowhere to be found. I might be wrong, but previously I used to feel Sid's mother could have been a prostitute and he can be a son of one of her clients...going by her poor looks and the way Sid would feel disgusted about his illegitimacy. But now I don't feel so.
So it could be like they changed this track too and have purposely brought in Aarti behl to connect with the past of shashank. If at all it happens, shashank juhi will come together and then she'll make an entry in shashank's life.