It's okay to sacrifice your happiness for your children.
Casey is a mother that has been offered the career of her dreams but it would take her away from her children.
Casey wants to do what is best for her.
Casey knows she made the decision to have children and knows they must come first, so she turns down the job opportunity.
Casey decides that the career is not worth passing up and takes on the job.
Casey is able to devote herself to raising her children to the best of her abilities, and they grow up well adjusted thanks to it.
Casey is absent from her children's lives as they grow up, and they never grow close to her.