。
She showed up around noon.
Literal
She [topic-は] noon-around appeared.
昼ごろ ('around noon') uses ごろ, a suffix that approximates time — 3時ごろ ('around 3 o'clock'), 昼ごろ ('around noon'). 現れた ('appeared') is a slightly literary verb for 'to show up / to appear' — more dramatic than 来た ('came').