Hey there Ronald! Welcome to the Disney Parks Moms Panel!
You can absolutely purchase a 5-day park hopper pass for your granddaughter with your credit card.
To make sure that the ticket you purchase is linked to your granddaughter, you will need to make sure that your My Disney Experience accounts are linked.
First, make sure that your granddaughter has a
My Disney Experience account. If she doesn't, you or her parent can create one for her or assist her, if she's older. Once her account has been created, you'll need to link your accounts in the My Disney Experience account, which will allow you to connect the purchased ticket to your granddaughter's account.
Once you log into your account, click on
My Family and Friends and scroll to the bottom of the page. Then select
Add a Guest. Follow the prompts from there and this will not only allow you to link the purchased ticket to your granddaughter, but also allow you to secure
FastPass+ for her and add her to dining reservations that you secure.
Ronald, I hope this wasn't too confusing. If you find that you need additional help with linking the theme park tickets to her account, you can call 407-939-4357 and a Cast Member can help make sure the ticket is linked to the correct person.
Happy planning,
Korliss