I'd say, if you give her anything, make it either defensive or supportive or some mix of the two. Since she has offense covered pretty well with her wind magic, you should give her something that either buffs it up, or helps her with her defenses. If you want to go defensive, I'd say maybe earth magic or go Erza Style and requip different armors and such, and for supportive or augmentive magics, I'd go for Fire for more offensive boosts, or Ice for more Crowd Control and status effects.
[@Sharyxe]