Mangala was watching keenly anandi's expressions and went on to make her more confused.
Anandi also should understand that Mangala wont harm Nandini the way Akheraj or Kundan would have harmed her. She should also play mind games. Could have told Mangala, ' mujhe koi farak nahi padta. Beti hai meri, mujh par gussa hone ka haq hai'.
They should arrest Mangala first and automatically Nandini will be separated from Mangala's influence somewhat. Mangala kidnapped Nandini and law should take its course. I think it is 10 years for kidnapping, misleading the police and running away from law.