|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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Like most wizards and witches in Great Britain, she likely purchased it at the age of eleven from Garrick Ollivander before beginning her education at Hogwarts School of Witchcraft and Wizardry in 1990.
She performed a wide range of powerful magic with the wand, from charms to defence. During her training with Dumbledore's Army, Cho also learned to produce a fully corporeal Patronus, a feat which Remus Lupin mentioned to be quite impressive.