Elara could already guess some of Rain's story, but she didn't interrupt her. Sometimes it was good to just let go of all the pent-up emotions.
Also, Rain didn't have anyone she could share her problems with too. She had such low self-esteem and an inferiority complex, that she probably thought that her problems would just cause trouble for others.
Or they would grow distant upon hearing her tale. People like her often overthink, imagining scenarios so wild that they wouldn't even make sense.
Yet, they did for them. And that scared them.
That was why Elara just patted her back, giving her the support she needed and letting her vent all of her piled-up trauma.