Who is Florence (Hurlbird) Dowell from The Good Soldier and what is their importance?

Florence Dowell is the wife of John Dowell. She is twenty-seven years old at the start of the novel's events and commits suicide at age thirty-nine. Florence likes to talk about what she knows on any topic. Her personal ambition is to marry a man who can give her a home in a great English county estate. She is an Episcopalian.