When the Salvis had visited the Khanvilkars too, Malavika left no stone unturned to make things sour and insult them. After all of that, Nalu will not want Sweetu to be in any house where she will be disliked and disrespected.
Malavika does not like Sweetu or the Salvis and she does not want Omkar's attention to be on Sweetu. But in the most recent episode, we think she takes it too far.
If Om and Sweetu take Dada to a hospital and Omkar does not come back for the press meet in time, Momo and Malavika will be embarrassed and Malavika could be very angry too.