The woman is merely trying to protect herself from a toxic family environment. She initially agreed to attend the wedding out of familial obligation, but the constant disrespect and favoritism shown towards the half-brother have made it unbearable. She has every right to prioritize her well-being and decline attending an event that will only bring her pain.
This woman is clearly overreacting to a child's words. Just because her mother laughed off a comment doesn't mean she should throw a tantrum and cause drama. She seems to be seeking attention and sympathy by making a mountain out of a molehill. Grow up and support your mother instead of acting like a spoiled brat.
The court acknowledges the woman's feelings of exclusion and disrespect. However, declining the wedding invitation based on a 5-year-old's comments seems disproportionate. While the mother's lack of intervention was insensitive, the woman's reaction escalates the conflict unnecessarily. She should have communicated her concerns more constructively instead of resorting to a dramatic exit.