You can try Pheran's suggestion to make the new xbox your home, but I just wanted to add that most times currency doesn't share so she may be out that 1000 coins. Note that changing your home xbox will require you to be online on your xbox to access purchases, the home xbox has offline privileges.
Support should be able to take them off your account and give you credit to buy them on her's.
Thanks everyone. I can see the base game on her account but not the add ins. I guess I'll try hitting up support. To bad they don't have an email option.
- onimushadavis likes this