NRS 125.360 Annulment of marriage contracted within State: No requirement of residence. Annulment of marriages contracted, performed or entered into within the State of Nevada may be obtained by complaint, under oath, to any district court of the State of Nevada for any cause provided by law for annulment of marriage.
您的朋友是可以考慮這麼做,相關的資料如下,
http://www.willicklawgroup.com/annulment
但是問題在於她如何舉證,她可能需要取得對方過去婚姻註冊的官方資料,老貓不知道這個資料在香港是否是公開的資料