She gave me permission to share the recipe with you.
Here is what you will need :
A basic cake shape. You can use a piece of dowel or a slice of cork or a foam bead as long as it is round and has flat smooth top. I was happy to use the eraser my little friend suggested because it already had a nice blue outside rim that looked like icing.
If you need to paint the blue icing on yours you will need some paint and a brush.
A printed picture of Elsa. I found mine on Pinterest when I looked for bottle top crafts.
Mod Podge and a brush.
Snow paint or caulking or puff paint.
If you need to add the blue icing to the side of the cake I suggest you do that first.
Leave to dry and cut around the edge of the eraser.
Apply a coat of Mod Podge to the top of the picture and leave to dry.
Paint Elsa's hair with the snow paint or your product of choice . Use a straight pin to model the hair a bit. Keep a photo of Elsa handy for reference. Use the pin to make a pleated pattern where the hair is pleated . If it does not work right away you can wipe it off because the Mod Podge will protect the picture and try again. Leave to set.
I had three erasers so we ended up with three cakes. They all turned out slightly different, because the pictures I used where slightly different too.