Olivier is only slightly surprised when she gets close enough to tell it is Lydia. The girl didn't run, or lie to her, so she's not going to give her a hard time. Everyone has to test their limits at some point. Besides, if she really didn't want to be noticed, she could have been in bat form.

"You are moving like a woman on a mission. Are you looking to test out how much a power boost night gives you verses day?"