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She tried to carry out a plan to save money.
Literal
She [topic-は] savings [object-を] do [in order to-ために] plan [object-を] carry-out [tried to-ようとした].
Nested purpose structure: 貯金をするために ('in order to save money') is the goal, and 計画を実行しようとした ('tried to carry out the plan') is the attempt to achieve it. ~ようとした (volitional + とする) marks the attempt — whether she succeeded is left unstated, suggesting the attempt may not have worked out.