。
She glanced at the newspaper.
Literal
She [topic-は] newspaper [object-を] briefly looked.
ちらっと is a state mimetic (擬態語) capturing the fleeting quality of a quick glance — just a brief, passing look. It's the adverbial form (with と), and variants like ちらり and ちらりと carry the same meaning with slightly more literary flavor. The combination ちらっと見る is an extremely common collocation for 'to glance at.'