Service Canada south office is now in North Calgary

and I don't want to wait 5 hours on hold so I am reaching out to our great community.....
My wife is expecting a baby in May

and we are trying to understand how maternity leave benefits work. on the service Canada site it states the following:
You have accumulated at least 600 hours of insurable employment during the qualifying period
Hours of insurable employment are the hours you work, for either one or more employers under written or verbal contracts of service, for which you receive wages.
The qualifying period is the shorter of:
- the 52-week period immediately before the start date of your EI period; or
- the period since the start of a previous EI benefit period, if that benefit period started during the last 52 weeks.
So, my question is related to the second bullet. My wife is a substitute teacher and started EI in July. She has continued to report every 2 weeks but we are thinking she should stop reporting if it is based on 600 hours since her last report.
if it is 600 hours from the start of her benefit period (shorter than 52 weeks) then is it counting from July when she first submitted a claim, or from her last reported 2 week period (ie December)?
I am hoping others have some experience with this or better yet work for service Canada and know the answer....the statement on the website wasn't clear enough for me I guess!