Well I hear it's very common so I don't know if she'd learn anything new. Maybe she would.

But I think such things should always be personal except with a partner when married or dating. I would feel uncomfortable if someone of any age was masturbating in public.

Do I masturbate? Yes, sure do.
Would I do it in public? No way.

But that's just my view, other cultures and people might have very different takes on it.