Once the cake layers are baked and have cooled down completely, level the tops. Fill the cake layers with buttercream, stack and crumb coat them with a thin layer of buttercream.
Cover the cake with purple fondant.
For the lettering, cut them out of gum paste with the alphabet cutters and attach to the cake board with shortening.
To attach the Minnie Mouse topper to the cake, insert 2 wires to the bottom of Minnie's face and then insert the wires into 2 lollipop sticks. Poke the topper with lollipop sticks into the cake. The lollipop sticks help prevent direct contact of the wire with the cake.
After Minnie Mouse's face topper, attach the purple and white flowers and butterflies to the cake, also with lollipop sticks.
Next, cut out white polka dots and attach them all over the cake in random order.
Once the polka dots are done, attach a thin rolled strip of purple border for the cake.
And then attach the side gum paste bow ribbons before putting on the bow. You may need to support the bow by holding it in place while waiting for the glue to dry. You can do this by tying a ribbon gently around the cake and the bow.