The Question and Answer section for A Wrinkle in Time is a great resource to ask questions, find answers, and discuss the novel.
Tessering doesn't agree with Meg and make her ill, thus, the escape made her sick.
This question calls for your opinion. There is no right or wrong answer. I might add Mother Teresa, Billy Graham, and Ghandi.
Aunt Beast cannot see, nor, can any of the beasts. They do however have a powerful sense of emotion and intuition. Aunt Beast asks Meg to communicate with her using her mind, and Aunt Beast sings to Meg..... healing her from within.