Family Sharing Apple Music

My daughter sent me an invitation to share me on her Apple Music plan but what happens is when I try to purchase coins for a specific apple game using my Apple ID her credit card is the default card that shows up when I try to make a purchase for coins. I want to keep my existing credit card on file for games etc...when she added me to the Apple Music Plan my card Information was deleted. How can I remain on her family sharing plan for Apple Music and use my Apple ID.

David