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If it's a game for more than one person you should be able to sign her in as a guest.
If she wants to play on her own you'll either have to let her use your profile or create a new one for her.
It one doesn't have to be a LIVE profile, it can just be an offline one.
Just dismiss to option to join LIVE when creating a new profile.
If your signed in to live just sign out then go across to create new profile choose your avatar then sign in with that avatar don't think you need an email address if your connecting the secondary profile to Xbox live