。
She gave a curt reply.
Literal
She [topic-は] curt response [object-を] did.
ぶっきらぼう describes a manner of speaking or acting that is blunt, brusque, abrupt, or unpolished — saying just enough and no more, often without warmth or social cushioning. It's a na-adjective, so it takes な before nouns: ぶっきらぼうな返事, ぶっきらぼうな態度. The word can be a mild criticism or a kind of gruff charm depending on tone; some people are simply ぶっきらぼう by nature without meaning offense. 返事をする is a light verb construction where 返事 ('a reply') becomes a verb when paired with する.