I moved here to the USA from Canada but already had my nursing license. All I needed to do was pay my money, supply a copy of my license and have a certain grade on passing my nursing exams in Ontario. You need to contact the Health Professions Board in Indianapolis and they will be able to help you.
I do not think that if your fiance is not licensed already from her native country whee she took the program, she cannot get licensed here. She will likely be required to go to Educational Credentialing to see what courses in the Phillipines corespond with the courses here in the USA. If they do, I believe she can take the NCLEX here but if not, she will need to take those courses here in the USA.
Best to call them in Indy or better yet, go to their office and speak to them in person.