So, at the start of the fight, you need to decide what you're going to do. Are you going to aim to transform her, or keep her as magical girl? Because transforming her will fully heal her, and raise her die rolls.

Not getting the villain involved at all (or letting her beat on them for a while) helps keep transform gauge down. So protection granting combat pages can be nice.

Her pages are mostly Ranged, so high rolling single die attacks can be used against them. And if you're willing to wait a bit, you can get pages that have +power to certain die to get a bit more of an edge.