There's at least one machine at Disney that presses dimes. There is also another that presses quarters. Could it be possible she simply found a machine that required dimes instead of pennies?
I know when I went to Boldt Castle, there was a "pressed coin" machine at a gift store on the Canadian side that did not take pennies, but rather had its own copper disks to press inside the machine.
Once you pressed your "coin" it had an additional thing where you could insert the coin and press a button (for free) and it would drill a hole in it for you.