Mara followed after Luke as they set out to change locations. Anakin might be trying to attempt at being friendly, but the smuggler wasn't even bothering with that much effort. The weight of her lightsaber was more of a comfort than usual in this situation, but she was hoping to avoid a duel.

We'll discuss everything later. Alone.

Her thoughts were directed very specifically at Luke, since she had no interest in having a tricky conversation with an audience like this. As far as Anakin and Obi-Wan were concerned, she was using every trick Palpatine had taught her to lock herself down. She had been taught to fool Darth Vader, there was a decent shot it would hold up with the men currently walking near her.