1) She began to feel ill in the afternoon of the previous day.
2) She was hot, then cold. She had a headache. She felt tired and sick. May be it was flu.
3) No, she didn't. She felt fine all morning.
4) She slept 18 hours in all.
5) Today she feels better.
6) She is staying in bed because she is enjoying the rest and reading a very good book.