@Enkryption Nibby definitely needs some sort of shapeshifting ability, which elemental magic would you like her to have? The basic element you pick will be the grounding for the wisdom based inert magic that gives her her shapeshifting ability, just a bit of flavour. If you and [Crimson Flame] are interested in nature magic, I think you'd have a basic grasp of earth, water, fire.
Nibby is the daughter of a male Dryad and an Arachne, so she's predisposed to Earth-based by default. Maybe a touch of Water and Fire to influence growth of plants by within her secret greenhouse/laboratory?
Shapeshifting for sure. I have a potential FC for her True Form.