That part about how she looks in the trailer makes sense. It's not just the editing, but i don't think she was always in her right mind during the filming process, so, naturally after getting better and finally looking to heal some of her demons, it makes sense that she'd be horrified at what she's seeing.
I'm COMPLETELY speculating here, but it's the vibe i get from what's been gathered so far. I think she truly didn't even recognize herself in that footage and was embarrassed more than anything else cuz she wasn't in that space anymore.
With the way the world is now, it may have exacerbated her typical embarrassment from something like this and really took her into a much lower space than usual.