ArmyOfficer

An Army nurse with a BSN or Associate's Degree in nursing from a US accredited nursing school is an officer. And a non-citizen can be an officer in the Army Reserve. So it is indeed possible for a person to be a non-citizen nurse and officer (but only in the Army Reserve). Once in the Army Reserve, a person is eligible for expedited US citizenship.

Green card holders can join the Army Reserve as nurses (and as officers) and get expedited US citizenship. MAVNI nurses enlist first, become officers, and get expedited US citizenship. A Canadian who is married to a US citizen can apply for a green card. A Canadian TN status holder can apply for MAVNI. For more information on how non-citizen nurses can join the US Army, I would suggest checking out the GoArmy website or the "Ask A Recruiter" Army message boards under "MAVNI HCP" (HCP=Health Care Professional). There is also a Facebook page for MAVNI nurses where a person can learn about the MAVNI process. In this person's case, however, it looks like she may want to think about having her husband apply for a green card for her, and then joining the Reserve, and getting her US citizenship through service in the Selected Reserve (Navy Reserve will work).