。
She's a really odd person.
Literal
She [topic-は] very has-changed person is.
変わった人 is a fossilized phrase: 変わった is the past form of 変わる ('to change, become different') used attributively to mean 'unusual / odd / eccentric' — literally 'a person who has changed,' i.e. departed from ordinary. The lexicalization is similar to English 'a peculiar character.' The bare 変な人 ('strange person') has more negative coloring; 変わった人 is more neutral, often even fond.