。
She was unlucky in love.
Literal
She [topic-は] love [at-に] was-defeated.
恋に破れる (こいにやぶれる) is a set expression meaning 'to be defeated in love, to experience heartbreak.' 破れる literally means 'to be torn/defeated,' giving heartbreak a visceral metaphor of battle loss. The expression treats love as a contest one can lose.