Weird issue--I know it's not about me

A coworker of mine recently made a post on her personal Facebook page which apparently goes against our organization's policy. I, along with some other coworkers, commented/reacted to it, and the next day, we received an email about appropriate social media behavior. This coworker went home early, so I didn't see her immediately afterward, but I realized later that she had unfriended me and at least one other coworker who commented. When I looked at her page, didn't see any posts from the past month or so. Today, when I saw her, things seemed strained an awkward. Maybe that was just my perception, and that she feels fine--I don't know. I really like her, and have enjoyed interacting on Facebook. She's a very open person, and I'm afraid she'll become less so now, and that makes me sad.
I don't know what to do, if anything. Mentioning it seems weird, but I also don't want to go on acting as if nothing is happening. I don't know how to ask what people need from me, but that's basically what I want to do. What if she says, "nothing"? I might end up feeling worse...

Maybe she thinks you reported her post to your boss?

I had thought about that, but she was friends with our boss on Facebook, so she easily could have seen it herself. She also would probably have no reason to believe I reported her. I think she understood that I sympathized with her post.

Talk to her. You say she's an open person and you really like her, so if she IS in fact half decent, she'll listen.

Maybe ask her to have a coffee, sit down and clear the air. Either way you'll feel better.

If you feel uncomfortable expressing your concerns face to face, maybe send her a email. I think you can also still send messages via Facebook even if you aren't "friended" anymore. That might be a good start. Maybe she felt it safer not to have co-workers as Facebook friends because, as an open person, she's happier with saying whatever she wants without repercussions at work.

theoutsider-
I think you may be right. Every time I have seen her at work since that initial day, we have had very comfortable conversations, and we have texted each other a few times, so I think she may just be slightly more guarded as far as having coworkers as friends of Facebook now. I feel like she is not mad at me, and, I was afraid of serious repercussions against her at work, but I think she may be okay now.