When it comes to billing, SuperGreen is not really a different subscription, but an add-on. So if you don't mind paying her fees and just want her to be able to use a Premium account, you could just make a Pack. She wouldn't even notice that there are monthly subscription fees when she is a Pack member. Only if she goes over the 10 free withdrawal limit or stuff like that, that will be billed to her account. And of course you can stay SuperGreen, that doesn't affect the pack.