。
She showed up even though I told her not to come.
Literal
Come-[negative-imperative-な] [quotative-と] said-[although-のに] came.
~のに ('although / despite') is a concessive connective that attaches to plain-form clauses and carries a slightly surprised or frustrated tone — 'I said X, but [to my surprise/annoyance] Y.' Contrast with けど/が (neutral contrast) or ても (concessive conditional). やってきた is the past of やってくる ('come [about] / arrive').