How to transfer Pokemon Go (using an Apple account) from iPhone to an Android phone?
Solution 1:
It depends on how she created her account. Sadly, if it wasn't through her email or Facebook or Pokémon account, but through her Apple ID, you can't. If it was through the other ways, all she would have to do is normally log in with Facebook/email/Pokémon trainer club account.
Solution 2:
Just open Pokémon go settings on iPhone, CONNECT the account to Facebook and on Android, sign in via Facebook. I don't know other way.