Why isn't Alice afraid of the Queen of Hearts?

Alice isn't afraid of the Queen of Hearts because she is only a playing card.

Idiot!' said the Queen, tossing her head impatiently; and, turning to Alice, she went on, What's your name, child?'

My name is Alice, so please your Majesty,' said Alice very politely; but she added, to herself, Why, they're only a pack of cards, after all. I needn't be afraid of them!'