She is so fussy that she rearranges the pillows every time someone sits on the couch.

fussy 是形容词，由名词 fuss（大惊小怪、小题大做）加上形容词后缀 -y 构成，表示"过分讲究的""爱挑剔的"，常用来形容对细节过分在意的人。