First off, I think that you need to walk through this with Toria, and help her understand how important that it is that SHE finds the courage to make a difference.
Chances are, that when this finally blows over for her, that there will be another girl behind her that will receive the brunt of P's bullying.
That she has the power, and resources to help stop this from happening to another girl. And that means being brave.
Secondly, think about what you said above, that Toria spends time around this girl more when she is with her Mother.
I think that I would tell her, that you want to respect her privacy, however, if SHE doesn't come forward to her Mother, then you will tell her on her own.
There also tends to be a lot of drama when one deals with a teenage girl. Try to dig for some more details, as much as we try to protect and turn a blind eye to our little princesses, she could very well be an instigator too. And crying Wolf because the tides turned on her this time.
Approach it cautiously, and thoroughly. But you do have to approach it.
Find your facts, and approach her Mother with only the facts.
Maybe schedule a conference with you, her, and the school counselor ???
That may work best....
Either way, her Mother needs to know. Now whether or not she chooses to do anything about it ? You can't worry about that one buddy...
