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Your friend can come and do some interviews while on a visitor\'s visa, but, there are so many things to do prior to thet:
1- she should apply for credential evaluation, this is a review of her education that is transferred to the state board she is willing to practice is, then, she should apply for licensure to that state, then this state will allow her to do teh board exam, and issue her a license once she passes teh exam, some states give her a temporary license for a limited time while she is waiting to do teh exam.
2- Once her license is ready, she should finf an employer who sponsors her, her best bet is an H-1 visa as a start, then, if teh wmployer is willing to sponsor her immigrant visa, they can start the process.