。
She tried to hide the facts.
Literal
She [topic-は] facts [object-を] hide-let's [quotative-と] did.
The volitional + とする pattern ([verb-volitional]+とする) means 'try to V' or 'attempt to V,' often with the implicature of failure or interruption — so 'tried to hide' often means 'tried but didn't fully succeed.' 隠す ('to hide, to conceal') is a transitive verb whose intransitive counterpart is 隠れる ('to hide oneself') — another clean vt/vi pair where the kanji root carries through both forms.