She [topic-は] living-expenses [object-を] parents [on-に] is-relying.
生活費 (せいかつひ) means 'living expenses' — 生活 (life/living) + 費 (expenses). ~に頼っている means 'is relying on' — the に marks the person being relied upon. This describes an ongoing state of financial dependence. 親 (おや) means 'parents.'