。
She's looking for a better job.
Literal
[topic-は] more good job [object-を] is-searching.
もっとよい仕事 ('a better job') stacks もっと ('more') with the i-adjective よい ('good') — note that よい is the more formal/written variant of いい, with both meaning 'good.' いい conjugates oddly: its past, negative, and adverbial forms all use よ- (よかった, よくない, よく), so よい is the more 'regular' form. 探している is the ongoing form of 探す.