Fortunately, the account didn't close if you can still access her self-serve account @Annimymom To confirm this, have them call 611 from their device with the Public Mobile service and they'll hear the account status relating to their account.
To update the payment card, log into self-serve, go under the Payment tab, then Manage Subscription.
If you are using mobile, you may have to tap the '+' sign to open up the menu options to see the Payments tab. On desktop, you'll see a right-facing arrow bottom left, that is the area where you tap to get to the Payment tab.
In that area, you'll see a Manage Payment Method section.
Click on that and you can update the payment particulars there.
