DS (Yr3) has a good friend, let's call her Jane. Jane is a lovely girl, with a good group of friends but a little lacking in confidence, after a few bad years at another school. DS has told me a few times in the last ten days that she's been picked on by one or two other boys and that he and other friends have defended her and told the teachers. The school seem to have taken it seriously and dealt with it well. I've told him that's good and to keep doing it, but also that Jane should talk to her mum about it. I'm fairly good friends with Jane's mum, but she hasn't mentioned any problems to me, so I'm not sure if Jane has told her mum about it.
So my dilemma is do I mention it to Jane's mum, just to make sure she's aware of it, or should I just leave it and not stick my nose in? And if I do say something, what's the best way to do so?