While they arrest her she accuses the Senior Oberoi's for murdering her husband in order to keep the killing of a "girl" a secret
So who would that girl be?
1- Chutki: Anika's little sister who would most probably be Ishana.
(ishana's re entry like this?)
She should have said child to make it clear
2- since it was shown someone is taking away Chutki from anika so their parents must have been killed.
So it might be their mother
3- that secret is definitely related to Anika and her family.