If her employer will give her a letter that says she was continuously employed through that period, working at least 40 hours a week, then you should be able to claim that experience.
Vacations are counted as part of work ex - if you take 4 weeks off, you won't say that you were only employed 11 months of the year.
Here's how the province of Manitoba defines a period of work
What is a period of employment?
The length of time from when an employee starts working for an employer until the day the employment ends.
The period of employment
also includes periods of temporary interruption in employment (a layoff, an unpaid leave) seasonal employment, and when an employee returns to work for the same employer after a break of less than two months. Employees who work in a seasonal industry and return to work with the same employer each season have continuous service. Each consecutive season they return adds one more year of service to their total period of employment.
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Here's Ontario
https://www.labour.gov.on.ca/english/es/pubs/guide/pregnancy.php
The Right to Earn Credits for Length of Employment, Length of Service and Seniority
Employees continue to earn credits toward
length of employment, length of service, and seniority during periods of leave.
Example: Length of service
Trina's employment contract states that she earns 1 paid vacation day for each month of active service and that after 5 years (length) of service she will begin to earn 1½ paid vacation days for each month of active service.
She is on pregnancy and parental leave for her entire 5th year of employment.
Because her leave will count towards "length of service" the year on leave will count to complete her 5 years length of service and she will be then be entitled to earn 1½ paid vacation days for each month of active service when she returns from her leave.
However, while she was on the leave she was not earning credit for active service and so under her contract she was not earning paid vacation days during the leave itself. At the end of the leave she would not have earned any paid vacation under contract but the employer would be required to ensure that she received at least the minimum vacation entitlement for that year (2 weeks of vacation time off plus 4% of any wages earned in that year).
