。
She didn't take much luggage.
Literal
She [topic-は] luggage [object-を] not-much carried went-not.
あまり~なかった uses the degree adverb あまり (not much/not very) with the negative past — she didn't take very much. 持っていかなかった is the negative past of 持っていく (to take away). あまり only works with negative verbs to express 'not very much' — with a positive verb, it would need a different construction.