。
She tore up the letter.
Literal
She [topic-は] letter [object-を] ripped-apart.
引き裂く (ひきさく) is a compound verb: 引く (to pull) + 裂く (to tear/rip) — pulling something apart forcefully. It's more violent and deliberate than 破る (to tear), conveying physical effort and possibly emotional intensity. The act of tearing a letter apart implies strong feelings about its contents.