meaning of Barbie doll head

Belle's attempt to briefly and quietly attend the company Christmas party is undone when the men begin to throw around a Barbie doll head that Belle had been carrying as a Christmas gift to give to her daughter (11-13). The doll itself, plus the unsightly Toys 'R' Us bag Belle carried it in, represent the additional work that Belle must take on as a mother, compared to the mostly responsibility-free attitude shown by the men.