It helps in cutting the overheads...the hourly staff take off Friday....perhaps also dropping her to a lower tax bracket.

She could also go to courses for non OHIP work and go into the highly lucrative cosmetic business...Botox etc., 

She could open up another business altogether to get another revenue stream going....starting one, then two , then three days per week then close the OHIP medical practice. 

Many MDs have more than one degree....they can resurrect their other degrees...two I know of have law degrees, lots of non OHIP possibilities.