Barbara Hinske, the author of the novel, posted a video on her facebook where she talks about her experience on The Christmas Club set.
We tried to download the video, but it seems corrupted, so we cannot cut it and add here the parts where she talks about Elizabeth.
Anyway she says that Liz and Cameron are kind and nice and they have great chemistry. She also said they changed the book a bit and that the movie has been set current days.
You can watch the video at this link.