DD (15) has been on the receiving end of degrading comments from a couple of boys in her friendship group. These boys will whisper to each other, go on mute during group calls then return saying "[DD name] won't like that one!", make images of a finger going towards DD's avatar from below, and generally taking "creepy" jokes too far (her words). One of the boys repeatedly describes women as "objects" to dd.
DD has been upset and tearful on and off for a few weeks about this now, and has asked if she can call a helpline to talk it through. (me and DH have said yes and helped her look for a suitable one).
She is asking me if it is her fault - as she has said no to being in a relationship with both of these boys at various points.
The key thing I'm trying to communicate to her is that she does not need to tolerate this behaviour, or any behaviour that makes her feel uncomfortable. And that this is not her fault.
Can anyone advise other ways I can support her?