。
She has been to Hawaii many times.
Literal
She [topic-は] Hawaii [to-に] many-times went [past experience-たことがある].
~たことがある is the standard Japanese construction for past experience — 'have done X.' Combined with 何度も ('many times'), it gives 'have been there many times.' Note the absence of any tense backshifting that English requires; the auxiliary ある stays in present-tense form even when describing past events. ハワイ has long been a popular Japanese tourist destination — its pre-WWII Japanese immigration history, sister-state ties, postwar travel access, and time-zone proximity all combine to make it one of the most visited overseas spots for Japanese travelers, sometimes called 'Japan's southernmost island' tongue-in-cheek.