Prudie - INFP, a pretty textbook unhappy one
Prudie's husband - ESTP?
Bernadette - ENFP
Grigg - an NF I think....kind of a goofy and sensitive guy, maybe an ENFJ
I agree with Sylvia as ISFJ.
I think Allegra is an ISTP. She seems to find the analyzing of the books to be stupid and is into extreme sports and thrills.
Jocelyn - I thought ExTJ also, so maybe an N. It's hard to say S or N for her.
"Charlotte sometimes dreams a wall around herself. But it's always with love - So much love it looks like everything else. Charlotte Sometimes - So far away, glass sealed and pretty." - The Cure
I was debating about Allegra being either an F or a T. The only reason I think that she might be an F is because of how emotional she is talked about to be. She does tend to act like a T in the way she talks about the books and the other members' comments. I think you may be right about S instead of N though. But I still think that she is an E. She so easily meets people.