I have an answer to number six.
Hedda commits suicide because she realized she had no control. She enjoyed manipulating everyone but in the end her plot for Lovborg went awry, Judge Brack had her in his control, and she was pregnant. Having a child would bear the ultimate burden on because everyone attention will shift from her to the child.
Hedda's behavior is very aggressive. Considering the time and setting, males were more aggressive and women were passive, behavior like Hedda's is unorthodox. Her father was a General and clearly had a great influence in Hedda's life. The pistols she owns are that of her father and she has a portrait of him in her room. Interestingly, her obsession for the pistol is symbolic of her male characteristics, and Freudian psychologists would consider the pistol as a phallic symbol representative of male dominance. The power behind a gun, the destruction it can cause, being capable to end a life, is a very empowering feeling in people. It makes one feel as if they were God, as if they were in control.
I hope this was helpful in some way.