
Someone struggling deeply with gender dysphoria, particularly someone who is still exploring their identity and thus perhaps lacking a community or solid footing of their own, should really (in my opinion) be in therapy. The best way to help your friend is to first of all support her in whatever direction this leads (you seem to be on top of that) and second to help her get counseling that will be nonjudgmental and will not be focused on identifying her as trans or not trans or genderqueer etc, but will just be a safe place where she can learn to cope with the dysphoria and explore all the caveats of who she is.