My 10 year old niece wanted a butterfly cake and was really pleased with this one. I made batter from 2 boxed cake mixes (yellow or vanilla cake mix), and baked them in 2 9×13 glass pans. I cut off the rounded top of each cake to make it more even.
Each wing was cut from one of the 9×13 cakes , and I used the left over cake pieces to make the center and head of the butterfly (several pieces were cobbled together but you can’t really tell once it is frosted).
I decorated using store-bought frosting, white frosting spread evenly over wings and chocolate for the center and head, then used a Wilton’s icing decorator for the pink edges (vanilla frosting with a few drops of red food coloring). I used M and M’s for decoration, and pipe-cleaners for antennae.
It was easy and my 13 year old daughter was able to help.
Related cakes:
Beautiful Butterfly Cake 
Cool Homemade Colorful Butterfly Birthday Cake 
Cool Homemade Butterfly Birthday Cake for my Niece 
Pretty Homemade Butterfly Birthday Cake 
Coolest Butterfly Birthday Cake Idea 
Sweet Homemade Butterfly Birthday Cake for my Granddaughter 
Happy Homemade Butterfly Birthday Cake 
Pretty Butterfly Cake for Twin Girls
I think that your butterfly cake would certainly delight a little girl. It would also be welcomed by anyone with a whimsical outlook and a special occasion to celebrate.
Your cake flutters!