。
She took it off.
Literal
She [topic-は] that [object-を] took-off.
脱ぐ ('to take off, to remove') is the dedicated verb for removing clothing — the opposite of 着る ('put on (upper body)') and 履く ('put on (lower body / footwear)'). It works for any garment: 服を脱ぐ ('take off clothes'), 靴を脱ぐ ('take off shoes'), 帽子を脱ぐ ('take off a hat'). 脱ぐ before entering Japanese homes is a strict cultural convention — shoes come off at the 玄関 (entryway), and slippers may go on. The brevity of the sentence is its lesson: a single transitive verb plus its それ object, with the wider context implicit.