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She rolled all her clothes up into the suitcase.
Literal
She [topic-は] all clothes [object-を] suitcase [into-に] rolled-in.
丸め込む is a compound: 丸める ('roll up / make round') + ~込む ('into / inside'). Literally she's bundling clothes into balls and stuffing them — a practical packing maneuver. (The same verb has a figurative sense of 'cajole / talk into', but here the literal physical sense applies.) すべての ('all of') uses 全て as a determiner before の. The に marks the destination of the rolling-in motion. Practical packing vocabulary you'd encounter in any travel or moving context.