The blogger was dying to get an interview with Dominic, but threatened Nina before realizing that she wasn't his secretary but his wife. This made her feel her chance of getting the interview slipping away, but as soon as she heard Jean saying that Nina had been robbed at the other party and the image of Nina wearing the jewelry appeared on the screen, she instantly put the pieces together.
She wasn't a famous blogger for nothing, she was attentive to details and when she saw Kira with the jewelry, she asked herself where she had seen those pieces before and when Jean showed the photos, everything became clear.
She immediately looked at the table where Kira was and saw her getting up and leaving with her family, and the blogger thought that this was her opportunity to apologize to Nina and get more notoriety for her. So she should be able to catch the thief.
