。
She cried bitterly.
Literal
She [topic-は] terribly cried.
Pairing ひどく ('terribly') with 泣く ('cry') yields a cry beyond ordinary tears — sobbing, wailing, weeping uncontrollably. Japanese has a rich vocabulary for distinguishing kinds of crying: 大泣き ('crying loudly'), すすり泣く ('sob softly'), 号泣 ('wailing'), 涙する ('shed tears, formal'). Choosing ひどく泣く puts the focus on the intensity rather than the manner.