。
She gave us something to eat.
Literal
She [topic-は] us [to-に] eat [nominal-もの] [object-を] gave.
食べるもの ('something to eat,' literally 'eat-thing') is a productive pattern for nominalizing a verb to express 'something one does X with / something to X.' Compare with 飲むもの ('something to drink'), 着るもの ('something to wear'). The もの noun (a generic 'thing') readily picks up a verb modifier to form these. Compare with the more formal Sino-Japanese 食物 (しょくもつ): same basic idea, but the longer kun-reading 食べるもの sounds far more spontaneous and conversational.