Even though...Mohini realized that Sonolika is Komolika, she will hide that fact from her family members. She does not like to Prerna as her son......... Anurag loves Prerna more and his first priority is Prerna.😔
Mohini does like and be dear to other girls over Prerna, because she knows that Anurag can't love any girl like Prerna. Then Mohini is the first priority of Anurag's love and life.
After realization of Komolika reality too..Mohini said at the party (during dance of AnuPre), she can control Komolika and her behaviour but not Prerna.
These all vibes bring up thinking that Mohini is not going to take any action against Sonolika.
In precap, I feel that Mohini was surprised by hearing Prerna's words about her love and baby. Mohini and Prerna's conversation will come after the heat argument and prena's slap to Komolika.😃😃😃😃