When they’re in crisis, you can’t go and see them in person. You can’t let them spend the night at your house. You can’t cook them dinner. You can’t go with them to a job interview. You can’t take them out for coffee. You can’t hold their hand or hug them. You can’t let them use your shower. You can’t be a physical contrast to the abusive people in their physical lives.
Even when they aren’t in crisis, you can’t see them, or sit on the couch and watch movies/tv with them, or go for aimless drives or 2AM Denny’s runs. It sucks.