Don't overthink what she posts on FB. Don't compare your blooper reel to her highlights shots. You don't know why she posted that particular video, if that message was for you or FOR HER. Really. I post stuff on FB all the time that is meant to remind me of where I want to be, rather than where I am. Don't overthink it. For sure don't think it reflects what she's thinking about the relationship.
And on the topic of FB -- be cautious about what YOU post there. Make sure it reflects who YOU want to be. Then when you do one of those end-of-year summaries or whatever, the overall message will be incredibly positive. FOR YOU. I know a lot of people slam Facebook, but I find it a great way to reinforce what I care about. My friends list is curated to people I care about and who add value to my life (yes, even old high school friends can make that list, if it's carefully curated). The links I post, etc., all reflect who I want to be, what I want my kids, friends, and family to think of me, and it becomes self-reinforcing. So if you're going to spend time there, make sure it feeds you rather than sucking you dry.
For the rest, I'm too new to have much advice, but know that I'm sending you positive vibes for the best possible outcome, whatever it may be.
Me42, H40 D12, S8, S7 A revealed: 7/13 Sep 4/14; Agreed to D 1/15