。
She threw on her jacket and went outside.
Literal
She [topic-は] jacket [object-を] threw-on [when-と] outside [to-へ] went-out.
引っかける (ひっかける) literally means 'to hook onto' but here means 'to throw on quickly, to sling on' — it conveys a rushed, casual action. The と conditional marks an immediate sequential action: the moment she threw on the jacket, she headed out. This と usage shows rapid, almost automatic succession.