Step 1
Preheat oven to 350 degrees F (175 degrees C). Grease four 8-inch springform pans and line with parchment paper.
Step 2
Combine 1 cup plus 6 tablespoons butter and sugar in a large bowl; beat with an electric mixer until smooth and creamy. Add eggs one at a time beating well after each addition. Sift flour in gradually and add the vanilla extract beating until smooth. Distribute batter evenly between the 4 prepared pans.
Step 3
Bake in the preheated oven until a skewer inserted in the center comes out clean 25 to 35 minutes. Cool in the pans for 10 minutes. Remove rings and transfer cakes to wire racks. Cool completely before decorating about 1 hour.
Step 4
Cut out a 2-inch hole from the center of each cooled cake using a round cutter of glass large enough for the doll to fit through.
Step 5
Glue cake board onto a revolving cake stand using a small amount of frosting. Spread 2 tablespoons of frosting on the cake board and lay the first cake on top. Repeat with remaining cake layers aligning the holes in the center; cake should reach the hips of the doll. Insert 4 straws 1/2 inch from the hole piercing all the way through the layers to add stability. Cut off the ends of the straws sticking out from the cake with scissors.
Step 6
Measure 1/2 inch from the top edge of the cake using a ruler rotating the cake and making marks with a skewer. Trim off the edge at an angle to create a dome-shaped skirt.
Step 7
Color 2/3 of the vanilla frosting in a bowl with a few drops of pink food coloring. Frost entire cake with a thin layer of frosting including inside the hole in the center using a thin spatula. Refrigerate cake for 30 minutes to 1 hour to set the first coat.
Step 8
Fill a piping bag with a large flat tip with frosting. Pipe frosting around the cake working from the bottom up until it is fully covered. Immerse a long icing spatula in hot water and dry thoroughly with a kitchen towel. Smooth frosting with the warm spatula for a polished smooth finish. Repeat process until frosting is smooth. Chill cake in the fridge for at least 1 hour and up to overnight.
Step 9
Wrap the doll's legs with plastic wrap and insert doll into the hole adding frosting to the hole if necessary to keep the doll in place.
Step 9
Divide remaining frosting into different bowls and color pink green and/or leave some white. Use the skewer to trace where you intend to pipe any patterns bows or other design elements over the frosting.