There is no actual proof that she did but Harry comes to the conclusion that she did and it's highly likely.
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Professor Severus Snape. Dolores Umbridge also disliked him.
To make Cho tell her where the Dumbledore's Army meetings were held and who was involved, Umbridge forced Cho to drink Veritaserum, which forces the consumer to tell the truth. (But only in the films, which have nothing to do with the books)
Hedwig Gutzeit's birth name is Hedwig Marianne Gutzeit.
Hedwig Herzog is 158 cm.
Dolores Umbride is a character from a book series called Harry Potter. The character first makes its appearance in: Harry Potter and the Order of the Phoenix.