。
She's very kind, like an angel.
Literal
She [topic-は] angel [like-のように] very kind is.
~のように ('like / in the manner of') creates a simile: she's kind the way an angel is kind. 天使 ('angel') is used as a comparison standard, which works the same way in Japanese as in English. とても ('very') intensifies 親切 ('kind'). A straightforward simile construction.