。
She's renowned as a singer.
Literal
She [topic-は] singer [as-として] name-high is.
名高い ('name-high') is the bookish cousin of 有名 — same idea, more weight. The compound is built straight from 名 ('name') + 高い ('high'), giving an image of a name that stands tall above others. You'll see it in literary writing, journalism, and formal speech more often than in casual chat, where 有名 fills the same niche. Pairing it with ~として gives the standard 'in the role of N, renowned' framing — として attaches a role or capacity to a noun and is the natural choice for this kind of identification.