I think
Jane is kind of classic and it would be fine as a first name. I like the
Jane Austen connection.
Jane would sound okay with both
Flora and
Matilda.
Jane and
Flora would be great together. I don't like
Jane and
Matilda as much. I think
Matilda is longer than the other two. I'd like
Matilda better with
Jane or
Flora if
Matilda doesn't go by a nickname most of the time.
good luck!