Originally Posted by
isladar
While you can't force an epiphany and make her change her circumstance, you can be there for her, emotionally. Often times, the abuser has so limited the actions or options of the victim that people reaching out to help is seen as an attack, and they capitulate to the tantrums of the abuser, returning to what everyone else can see as a bad relationship. As someone on the outside, this can be immensely frustrating. Don't give up. Let her talk, and if you're comfortable with it, talk to her about your experiences with abuse. It is very, very hard sometimes to equate "what I'm experiencing right now with a living, breathing, person" and "abuse"; a friend sharing that they've been through something similar could help.
And while I'm sure you know this, I'll say it for everyone else: just because there has not been physical violence does not mean this is not an abusive relationship.
It's the worst. I don't know where you're living at the moment, but I'd recommend finding out your country's available resources for help for abuse victims.