Also, you mom would have to send you a picture with the sticker removed showing the last four digits of the card and the EAN number.
Then you can purchase a gift card, and combine all the balances.
That is what I did a few weeks ago. Forgot the gift cards in the safe at home.
We stopped at target, bought a gift card, then went to the my Disney gift card site, and transferred the balance to the new card.
Oh, and a hint, I tried to enter a card that had not been activated, and it would not accept it. So you have to put something on the card to start.