Yes, if she has a qualifying post-secondary diploma plus three years of related technical-writing experience, holds Canadian citizenship, and has prearranged professional work whose duties are technical publications rather than marketing; the treaty does not require those three years to follow the diploma.
The diploma route is real, but the experience must be proven to the month
The professional list gives two credential paths for Technical Publications Writer: a baccalaureate or licenciatura degree alone, or a qualifying post-secondary diploma or certificate combined with three years of experience. A diploma holder must document thirty-six months of work related to technical publications writing with reliable dates, but the USMCA text does not require that experience to begin after the diploma. Unrelated customer-support or advertising-copy work does not count merely because it involved writing.
She must also be a Canadian citizen, have prearranged professional activity for a U.S. or foreign employer, avoid U.S. self-employment and disclose ownership, and seek a temporary stay.
Canadians may apply at a port of entry or through an eligible Form I-129 petitioner. A spouse and unmarried children under 21 may hold TD and study, but they may not work. Hypothetical example: a marine biologist has a matching degree but accepts a role that is described mainly as selling laboratory supplies.
The degree does not settle the case; the first review compares the everyday duties with the listed profession and asks the employer to correct a sales-heavy description. The record that settles the issue is the signed offer with a specific duty breakdown, not a broad job title. She should resolve that mismatch before choosing an admission date.