彼女はパスポートを無くして困っていた。

she; her; her; girlfriend; sweetheart

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

passport

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to lose something; to get rid of; to lose someone (wife, child, etc.)

to be troubled; to be worried; to be bothered; to be embarrassed; to be stumped