。
She wanted to get married right away.
Literal
She [topic-は] right-away marry-wanted.
~たかった is the past tense of ~たい ('want to'). Built by treating ~たい as an i-adjective: 結婚したい ('want to marry') → 結婚したかった ('wanted to marry'). The ~たい auxiliary normally restricts to first-person desires in Japanese, but the past form opens up some third-person uses, especially when describing a state of having wanted something, viewed retrospectively. Past-tense desire often carries an implication that the desire was unfulfilled — though context may also leave the outcome ambiguous.