Marinette wasn't thinking about meeting and ending up dating any boys while here, of course. Not that it necessarily stopped her well-meaning protective dad, of course. Still, she does appreciate the money and the ticket to the concert, so she takes them up on the money, the offer to go find something to wear. She gives a shrug at the boy band, unsure if they seem like her kind of thing, but then she hasn't heard their music, and she knew appearances could be deceiving, given Rose and her music she enjoyed, for example.

She doesn't sense anything the same way Tikki does, but she does get alerted to it when Tikki waits till they are alone to speak up, telling Marinette to follow the girls. So she does, while trying not to seem too suspicious about doing so. Sure, she was supposed to find an outfit but it isn't like she didn't also bring clothes anyway. And besides, if Tikki felt something, then this must be important.

Except. This is Marinette so of course she is a klutz and trips on something. And falls. Making a lot of noise. So much for stealth in finding out about this 'training' they mentioned?