Clarissa hemmed and hawed her way through volume 2, but decides to go off with Mr. Lovelace at the very end. We learn that her friend Anna Howe's mother doesn't approve of Clarissa's general attitude toward her duty to her parents. We also find out that some of the nonsense that Clarissa's parents are subjecting her to is due to Mr. Lovelace himself. Apparently that's how you got a girl in 1750. You went behind her back and caused her parents to pretty much force her to marry someone else.
I'm definitely looking forward to reading volume 3 to see the uproar amongst Clarissa's family members when they realize she has headed out!