The book, not the movie, but feel free to type either.
Mirabelle - INFP
Ray - INTJ
Jeremy - INTP ???
Lisa - ESTP
Mirabelle might be INFJ....? I related to her a lot, except occasional descriptions of her thinking, which sounded more Ni than Fi to me, but then maybe that's cuz Steve Martin is likely an INTJ and, IMO, nails Ni Te pretty well in his Ray character. For the most part, she seems judging dominant, but perceiving and easy-going on the surface.