。
She screamed for help.
Literal
She [topic-は] help [object-を] seeking scream let-out.
助けを求めて chains with 悲鳴をあげた — she sought help by screaming. The て-form connects the purpose or manner (seeking help) with the action (screaming). 悲鳴をあげる (to let out a scream) is a set phrase; note the hiragana あげる here rather than the kanji 上げる — both spellings are used.