Show Eloise is a teenager. In the book she's much older, so I can see a more mature and more lonely Eloise going in that direction. She didn't plan to fall in love with Philip, she was just sad and lonely and had her tether cut when Pen and Colin got together. It was a surprise to her that she came to care for Philip so much. I can see it if they set up her personality growing and changing, and maybe slip in some subtle hints about the correspondence.
I was trying to figure out if Jack was the name of Francesca's first husband, but I remember now that she's still too young, unl