。
She caught my eye.
Literal
She [topic-は] my attention [object-を] drew.
注意をひく (literally 'pull attention') is the standard idiom for 'attract / catch attention.' ひく ('pull, draw') is an extremely productive verb in Japanese — it pulls cars (車をひく), draws lines (線をひく), looks up dictionaries (辞書をひく), catches colds (風邪をひく), and attracts attention. The hiragana spelling here keeps things simple; the kanji could be 引く. ぼく is a casual masculine first-person pronoun, marking the speaker's gender and a relaxed register.