[RunDownHouse]

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Hermione uses non-verbal spells when they're sneaking into the Ministry.

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Really? I'll have to go back and look into it. Does anyone remember the spells specifically?

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I just finished re-reading the book, and they use non-verbal spells all the time. Specifically, at the Battle of Hogwarts, Hermione is running out the front, sees someone getting attacked (Hagrid, maybe?), and yells, "NO!" No other incantation or whatever is made, but she shoots off a spell anyways. Also, she uses Levicorpus in the vault at Gringotts, which is introduced in HBP as specifically non-verbal.