I am just rambling, but I feel your pain. A strong willed woman is a force to be reckoned with.
You do the fitting and shaping, she does the decorating?
Let me ask you, has she been to shoots, and seen other boys and girls shooting? Sometimes an appreciation of what others are doing will give you a different perspective, even to to the point of changing what she wants to do. Also at this stage in her life, her ideas change faster than her shoe size. Expose her to different things, history, and watch where her interests lie.
It sounds like the two of you might have different expectations. If each of you hold firm to what you want out of this project, then you might not be enjoying it as much.
Suppose you finish the stock or seal it so that it can be easily stripped when she grows out of the pink phase?