what's so unusual about mrs. whatsit

Mrs.Whatsit is a horse type thing. She is able to fly and she has like a horse type body. She changes into this in times of need. She once used to be a star (like in the night sky) but she let The Dark Thing take her life to save a planet. Now it made her into this...thing. She is still very upset about it. But also she is a chosen one because they don't ask people "as young as her" to be one of the defenders against the Dark Thing and It. shes like somewhere in the 2 or almost 3 billion years old and its young compared to the other W's.

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i need help finding facts about this book please help me

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