The article says two women were involved, the mother and the babysitter. How irresponsible could the SP be if she hired a babysitter? Could it be that the babysitter's "involvement" was babysitting the kids so that they would not be exposed to any of the prostitution? Could it be that the mother was being responsible, instead of say leaving the two year old in the care of the twelve year old (legal in Ontario), and going out to work?
Could it be that the police sometimes skew things to look a certain way, to justify actions that they wish to take? I have no additional information, I am just supposing.