I haven't read all of this but I read the article from the link.
I can totally imagine how she might feel - I might be wrong of course.
The thing is, as would say - 'he's a jerk, but he's my jerk'. (irrelevant link)
You're in a relationship, and yes the person is wonderful, but is also dangerous or unfeeling or cruel. You forge yourself a persona, a role, be it as a 'nurturer' or something else, in order to cope with the abuse or difficulties. But you still want to be there, with that person you're in love with, until (and this may never come) the day you mentally and emotionally detach from them.
This requires a tipping point. She may not have reached it. In the interim she needed to preserve her illusion of coping, of being fine as long as she was in control, in her home made role which allows the behaviour to continue and not undermine her entirely.
Then someone shows up what is really going on and of COURSE she will feel awful. Because it's exposed things to everyone that she didn't want them to see.
I feel desperately sorry for her. I have a feeling she may have trouble separating love from abuse, if she grew up with abuse. That's something we can't help her with. It also explains the detachment in her statement that she's 'not some battered wife'.
I think this is something that actual battered wives ought to ignore, because it's clearly said by someone who cannot allow herself to feel like a victim. It's actually just very sad.