I'd call her a fairy? By Ivore's standards, at least?

[and as Gokudera had suggested, she does kind of do her own thing - she isn't at Linneus' shoulder all the time (still perhaps more often than he realises), though he occasionally sees her light zipping about the room in the evening, and the garlands adorning his flower arrangements are always refreshed when he wakes in the morning.]

I would like that. I think it would be best to get to grips with one kind of magic before I start looking at another...!