。
She poured all her energy into the work.
Literal
She [topic-は] that work [target-に] all-energy [object-を] poured-in.
注ぎ込む ('pour in,' lit. 'pour-into') is a compound verb fusing 注ぐ ('pour') + 込む (the auxiliary 'into / deeply'). The ~込む suffix is highly productive for 'in / fully into / deeply' meanings: 飛び込む ('jump in'), 教え込む ('drill in, teach thoroughly'), 抱え込む ('hold close, bear inwardly'). 全精力 ('all one's energy/might,' Sino-Japanese) is a heavy phrase; combined with the verb's image of emptying liquid into a container, the result is vividly metaphorical: she poured her every drop into this work.