。
She's still relying on her parents.
Literal
[topic-は] still parents [on-に] is-relying.
親に頼る ('rely on parents') is the neutral, descriptive phrase for an adult child still depending on parental support — financially, emotionally, or both. The same situation finds colorful expression in the idiom 親のすねをかじる (literally 'gnaw on a parent's shin'), which carries metaphorical color and gentle critique. Choice between the two signals stance: the bare verb is neutral observation, the idiom adds shading and a hint of judgment.