Presence Concealment [A]
A skill that allows one to take action while hiding themselves. It's a skill that those of the Assassin class possess as it's their most basis ability, but Passionlip has acquired it as well, possibly due to her personality.
Due to her timidness and cautiousness, she manifests excellent Presence Concealment, but her giant claws act as a hindrance and she is quickly discovered. If she didn't have those claws, she would be an excellent stalker.
Though this is a digression, she has been following [the PC] from early on, though no one noticed, observing and watching over them from the shadows, or something like that.