Hey peeps... I need help with something. While we were at WDW, DD(12) got a ring that she just loved and now it's gone

!!!
It was a silver ring with Mickey diamonds and her initial. We found it at AK but hey didnt have her first name "K" and the CM said it was an outside company and they were not sold everywhere, so she got the last name "C", then at DTD the World of Disney, we found a "K" and was able to trade it. The K's are hard to find. She was sooo HAPPY!!
Then at the airport when we got home, she washed her hands and forgot it on the sink in the bathroom

she remembered as soon as we got to baggage claim, we went to go back and security wouldn't let us go back to that area! The man was sooo rude and huffed and puffed when I asked him to go look because we were the only plane in and it was midnight and there was no people around, we just knew if he let us go in we would find it right there on the sink! ARGGGG He said he went and looked but I know he didn't. It is gone. I did report it to lost and found... but no word on it.
It was only $18.00, but she LOVED it and I am so sad for her.
SO help... how can I get another one? I can't find it online? Can I call the store World of Disney? What can I do? I want to get another "K" ring and give it to her for Christmas

!!
HELP, ideas???