Although Panchi doesn't share a very easy chemistry with her on-screen son, I believe she is performing quite well, given the shackles of a pathetic script!
Read somewhere that she didn't look surprised enough to see that scary Ayesha in a wig....but, personally, her reaction was quite realistic. Both Milind and Prachi were slightly shocked to see that lady, but they didn't believe that it was Ayesha, and hence kept a straight face!