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She remade her old clothes to look more fashionable.
Literal
She [topic-は] her own old clothes [object-を] more fashion [to-に] visible [so that-ように] remade.
~ように turns 流行に見える ('looks fashionable') into a purpose clause: 'so that they would look fashionable.' 流行に見える itself uses 見える for spontaneous appearance plus 流行 ('fashion, trend') marked with に as a state-target. 作りかえる (作る + 替える, 'to make + to swap/replace') is a compound verb meaning 'to remake, refashion, redo' — the standard verb for upcycling clothes.