I gifted 25$ to my mother.

I gifted on May 11 $25 to my mother. On May 12 it did not show up in her emails and the money had not deducted from my itunes account.So I sent the gift again figuring it had not completed the transaction. Well later in the day we noticed that the email arrived in her account two times. Is there anything I can do? Her Ipad is the first ipad and she does not seem to have the capability to send a gift. She only opened the first email and redeemed it. She did not open the second. Help!!! So confused