IMDBPro account for child

I have my IMDBPro (free) account linked to my Amazon account. I am trying to set up an IMDBPro account for my daughter (14) and don't want to create a whole new Amazon account just for her. Is there a way to link her account with my Amazon account since I will be the one paying for her account until she's 18? Is there an alternative way to sign up minors that doesn't require an Amazon or separate credit card - since they can't legally have these accounts in their own name.