The young girl about to get married is receiving the message. The message is that the mercenary and her mother both know she was the theif and that she is also accused of being a murderer and will be caught soon enough.
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You are on track. The female mercenary is telling the girl that she knows the girl took the sword and that in order to avoid a major catastrophe, the girl needs to return it. The girl is also told how serious the situation is when it is revealed that the person who was killed was a police officer. Interestingly, all this info is conveyed in casual conversation between the female mercenary and the girl’s mother. I don’t think the mother knows her daughter does martial arts or took the sword – I think mom is completely oblivious.