I thought she was pretending to show them that she didn't want to get caught. Like she doesn't want Mehras to know she is a thief.. so that she can keep with with her thief acts. It's not like she wants to go out of the house on her own.. She wants them to throw her out by knowing indirectly that she is a thief.
Mina she didn't agree to the theft just yet because she knows they won't believe her even.if she admitted herself, I think she was trying to get Tanu to show them solid proofs so they don't have any doubts left.
Not how I read the scene at all. Interesting.
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