Where do Ella and Char find a tiny pair of slippers? What do Ella and Char do after Ella put on the slippers?

While looking for a secret passage in the castle, Char and Ella find a gardening shed with a trunk of tools in it - under the tools they find a tiny pair of glass slippers. Char tells Ella to try one of the slippers on and they fit perfectly. They then dance together in the garden shed until the music ends.