I would suggest getting her either one of the 2 bracelets mentioned in title and then purchasing a charm or two at while in disneyworld.
I have a pandora and each holiday / special day, I ask my husband and kids to get me a charm. It's a wonderful momento.
Bracelet itself is silver, costs under $50 and charms can cost anywhere from $20 to over $100, depending on the material.
On our recent trip, I purchased 2 charms, each cost $23 at the Grand Floridian gift shop. One is cinderallas carriage and the other has disney heads. Don't have pictures but I am sure you can find it on line somewhere.