As soon as she becomes PR and meet all the items listed in Part A; you would be eligible for OHIP.
I'm not sure you understand how all that works - the criteria in section A basicallhy mean you're covered once you move to Ontario, as long as you've moved there and will be there for x days in the next six months, and thereafter for whatever number of days per year.
So for example: if she's in Ontario the day she becomes a PR - or lands and becomes a PR - she can basically go the next day to get OHIP coverage. As long as she doesn't leave for more than 30 days in the next x days. (And that would amount to them clawing it back, but let's not get bogged down in details)