Hello Arjun,
The requirement is "one year continuos employment" in the past 10 years in a profession listed in the 29 Occupations list. This is for her to qualify under the skilled worker category. This one year, just one year, she has to be employed with out gap.
The other requirement is maximum points for work experience. For this if she has 4 or more years of experience, continuos or otherwise, she will get full points.
My personal opinion would be to apply this year with your wife as the principal applicant. You never know what new rules come in next year and also you would have lost one full year.
Trust this clarifies your doubts.
All the best.