Unfortunately, no.
A gift card cannot be reopened after it has been delivered to the recipient. We partner with Tremendous to offer this gifting feature, and once the gift card is sent to the recipient, the money transfer to Tremendous begins and can not be reversed. Tremendous allows just one "deposit" of funds per board, so we're not able to collect additional funds to be added after delivery and send a second "deposit".
With that being said, please contact help@kudoboard.com if you have individuals who would like to donate monetarily to the recipient after a gift card has been delivered. We'll help you out with a workaround!