。
The wind blew her hat off.
Literal
Wind [subject-が] her hat [object-を] blew-away.
帽子を吹き飛ばした — active voice with the wind as the grammatical subject performing the action. The compound verb 吹き飛ばす ('to blow away') stacks 吹く (to blow) + 飛ばす (to send flying).