。
She was kind to us in many ways.
Literal
She [topic-は] us [to-に] variously kind do for-us.
親切にする means 'to act kindly, to be kind to someone' — the adverbial に form of 親切 turns a quality into an action. The pattern [na-adj]にする means 'to do / treat in a [na-adj] way': 大切にする ('treat preciously, take care of'), 静かにする ('be quiet'), 元気にする ('cheer up'). いろいろ ('various, various ways') here is adverbial — 'in various ways, in many respects.' With ~てくれる, the kindness is foregrounded as a benefit to the speaker's group.