Cinderella is fairly regular at the Disney Parks.
At Walt Disney World she can sometimes be found in France at EPCOT (though not often), and the Akershus Restaurant. In the Magic Kingdom she is normally at the Town Square Theater. She can also be found at Cinderella's Royal Table.
In Disneyland California Cinderella can be found at the Princess meet 'n' greet in Fantasyland, and Ariel's Grotto at DCA.
In Disneyland Paris she is often at the Princess Pavilion, and in Auberge de Cendrillon in Fantasyland.
In Tokyo you can find her in Fantasyland.
In Hong Kong she meets by the Wishing Well in Central Plaza.
During the longer DCL sailings, Cinderella will normally make an appearance. Check your Personal Navigator on board for details.