。
She came right away.
Literal
She [topic-は] right-away came-along.
やってくる is a productive compound built on やる ('do') + the directional auxiliary くる ('come') — together meaning 'come along, come over, come up to here'. The やる frames the coming as an active, intentional motion rather than just arrival. Common in narrative — 'and along she came' — and in news contexts ('a typhoon やってくる'). The past form やってきた marks the completed arrival.