I see your point NOP but it is not my nature to be vindictive and I see calling and threatening her just that.
I don't see that as vindictive, rather a strategy to be used in encouraging her not to contact hubby.
If I was one of the parents whose child she was teaching, it would matter to me if she were basically prostituting herself.
Vindictive speaks to revenge. I wouldn't encourage you to get revenge, but I would encourage you to get her stopped.
-NOPkins-
I will ferret out an affair at any opportunity.
-An affair is the embodiment of entitlement, fueled by resentment and lack of respect. -An infidel will remain unreachable so long as their sense of entitlement exceeds their ability to reason.