who was miss betsy trotwood and why did she vanish like a discontented fair?

Miss Betsey is David Copperfield's great-aunt.

"Discovering from the attending physician, Mr. Chillip, that the infant is not a girl as she had hoped, and that therefore the child cannot possibly be christened "Betsey Trotwood Copperfield" (9), Aunt Betsey says nothing, but apparently has inwardly vowed to have nothing further to do with either the child or his widow-mother, vanishing "like a discontented fairy" (ch. 1, p. 14)

She takes David in to her home when he runs away from his evil stepfather's factory; she also educates David at a good school and then pays for his "articles" (basically, an internship) at a law office in the legal district of London

Miss Betsey is David Copperfield's great-aunt.

"Discovering from the attending physician, Mr. Chillip, that the infant is not a girl as she had hoped, and that therefore the child cannot possibly be christened "Betsey Trotwood Copperfield" (9), Aunt Betsey says nothing, but apparently has inwardly vowed to have nothing further to do with either the child or his widow-mother, vanishing "like a discontented fairy" (ch. 1, p. 14)

She takes David in to her home when he runs away from his evil stepfather's factory; she also educates David at a good school and then pays for his "articles" (basically, an internship) at a law office in the legal district of London