1) She is going insane from her father dying.
2) She wants to show everyone how she feels about her father's death.
3) She's mad at Hamlet.
4) Gertrude, Laertes, and Claudius are all worried about Ophelia.
5) Everyone's attention is on her during scene 5 only.
6) It lets us know how the family is acting. I didn't really learn anything new. I didn't gain any insights from Hamlet.
7) Why she is going so insane.
8) How Ophelia felt that Hamlet killed her father. She is shaken up and going insane.