As an L-2 spouse she is employment-authorized incident to status, so immigration law does not stop her working. Whether she can practise nursing depends on the state licensing board, which is a separate process with its own credential review.
Immigration permission and professional licensing are two gates
The L-2 spouse's work authorization is broad: she may take any lawful employment. But a regulated profession requires state licensure regardless of immigration status, and nursing boards examine education, examinations and language on their own timetable. Start the licensing enquiry as early as the petition, because the board's process can take longer than the immigration one. If she instead wants to work outside nursing, or remotely for a Nova Scotia employer, the L-2 authorization covers that, subject to tax and the employer's own rules. Children in L-2 status may study and may not work. Relationship evidence — the marriage certificate and children's birth certificates — is required for each family application. Hypothetical example: an East Hants household plans on the spouse's income from day one and discovers the licensing board wants an English-proficiency test she has never needed. The immigration file was fine; the household budget was not.
Hypothetical example: the spouse of an East Hants process engineer is an orthotics technician who expects to begin work when the family arrives. The first review separates immigration authorization from the state credentialing process, then obtains the board's written requirements for education, examinations, and supervision. A job offer cannot settle a licensing question. The household should budget for a period in which the spouse may be permitted to work generally but cannot practise that occupation until the state's registration rules are met.