You can't...and well shouldn't. Telling any child, six years old, 12 yrs old 17 trs oldany child that they shouldnt be doing that thing that they have been doing, so enjoy doing and would just assume do it anyway especially now that they've been directed to do differently...
You should be telling her all the stuff she could be doing...what does she have a passion for music sports photograph cheerleeding theatre...the list is near endless. Validate get feelings I'd, you realize him moving awayhas been heart breaking to her, that she feels devestated and you know she's hurting...and because it has been so difficult youwanba try and help I. Sine small way...offer to enroll her in classes, ask f she wants lessons of any kind, get her and her girlfriends together take them all out to somewhere cool...
The key is show her what wonderfully co stuff she could be doing how great it feels to do, the fun she can have if shed just live and experience her life and...should he call she can always call right back. If she's not having too much fun :)
Build up her worth her self assuredness and her sense if self lest she lose it to some boy. Instill independence!!!! And love her, love her, love her and all the horribly unfit choices she makes :)