Super Power/Mutation: The ability to manipulate the senses. She will find this extremely difficult to control but it will manifest as, if she chooses to go off on a tangent about cookies, suddenly the smell of cookies will fill the room! If she's imagining a robot/alien battle, maybe you'll see it too. None of these effects are really there; it's definitely got a fairly small radius of effect; and she can't do it unless she's invoking her full imagination as opposed to if she's trying really hard.
Reasoning: This is basically an extension of the imagination-based crazy which she is already so very good at. Using whatever completely random neurons are firing in her head at all time, she will be able to manifest new sensations, but it's (in her mind) a harmless fluffy ability that is sort of opposite (and more Orihime-friendly from her own view) her canon ability to reject.
Any last questions? N!
It might be helpful if you included an additional field for, like, "means of effect" (like, is it targeted to one person? is it area-of-effect centered around her?)