She doesn't know about th stammering problem. She didn't get to hear her stutter in yesterday's episode. whenever she speaks to Vasundhara she says a few words. Yesterday also when she brings besan laadoo for Vasundhara she informs badki and Chutki about it first, and they communicate the same to Vasundhara. All the opportunities of her getting to know is been defied tis way by CVS