。
She's not old enough to get a driver's license.
Literal
She [topic-は] drive-license [object-を] take [for-には] age [subject-が] insufficient.
~には after a verb is the purposive ('in order to / for the purpose of') with topic-style emphasis — slightly stronger or more explicit than plain ために. 年が足りない is a fixed phrase, literally 'years are insufficient,' meaning 'too young.' The standard minimum age for a regular Japanese driver's license is 18 — a slight cultural footnote: Japan grants only 普通自動車免許 (standard car license) at 18, with motorcycles available earlier and large/commercial vehicles only after 18-21+. For 'too old' the parallel idiom is 年が行きすぎている or 年を取りすぎる.