How did Marshall contribute to Emma's feelings of inadequacy in the novel, Vera Wong’s Unsolicited Advice For Murderers?

Emma is extremely intelligent and well-spoken for her age, but shy and nervous around others. This leads to Marshall ridiculing Julia’s parenting as he constantly mocks and belittles Emma for acting her age. Once Marshall leaves and Julia starts to trust her own mother instincts, Emma begins to thrive, developing relationships with Oliver, Vera, and the other suspects. By the end of the novel, Emma has regained the confidence her father took from her with his unfair expectations and emotional abuse.