Why does Angela have to run away from her mother to stop herself from crying?

Grace treats Angela like a little girl at the party, fixing her hair and questioning her choice of clothing. This upsets Angela, who is beginning to resent being treated like a favorite doll. Her mother also embarrasses her with her criticism of her partner.

“There you are, dear.” Grace patted a stray wisp of Angela’s hair into place. “We must do something about your coiffure. I’ll make an appointment for you with my hairdresser once the snow is cleared; long hair is too youthful for a woman about to be married. I can’t understand what got into you, Angela, coming to this party in that old checkered dress and those awful accessories. Just because your partner dresses like a freak…”