。
She didn't show up at the party yesterday.
Literal
She [topic-は] yesterday party [at-に] did-not-appear.
現れる ('to appear, show up') is the intransitive counterpart of 現す ('to reveal, show'); paired with the locative に, it pinpoints where someone failed to appear. The negative past form 現れなかった converts 'showed up' into 'didn't show up' through plain inflection — no separate auxiliary needed. パーティー is an English loanword fully naturalized into the language, written in katakana with the long-vowel mark ー standing in for the English 'y'.