。
She insisted that we go.
Literal
She [topic-は] us [subject-が] go [as-ように] strongly said.
~ように言う ('to tell [someone] to do X') is the indirect-command construction. The embedded verb takes ように, marking it as the goal/manner of the telling. 強く ('strongly, firmly') intensifies the verb 言う — 'said firmly / insisted.' Compare with the bare 言う to see how adverbs upgrade the speech-act force. が here marks the subject of the embedded clause: 'we go,' inside her instruction.