。
She has 2,000 books.
Literal
She [topic-は] two-thousand-volumes books [object-を] is-having.
Note 二千冊 placed before 本を — Japanese typically has the numeral-counter precede the noun's を-clause as an adverbial. The counter ~冊 is for bound printed materials (books, magazines). Compare ~枚 (flat objects), ~本 (long thin objects).