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 always at Princess Fairytale Hall. 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 sometimes meets by the Wishing Well.
During the longer DCL sailings, Cinderella will normally make an appearance. Check your Personal Navigator on board for details.