Season 8 finale was just on TV, so I watched it and I saw something I haven’t noticed before.
When Booth says they shouldn’t get married, I swear I saw the little eight years old girl, who found the perfect wedding dress, turning into the sad 15 years old girl whose life changed so much she thought she will never get to wear them. The sad girl who was suddenly alone in the world after her parents dissappeared and built walls around herself to protect herself because she got hurt. But with Booth, Brennan allowed herself to be that little girl before all the bad things happened again and she took a risk because her life with Booth had been so wonderful she thought she could get the happy ending after all. She trusts that happiness and makes herself vulnerable by showing Booth yet another part of herself - showing him she did want to get married once but made herself not want it - only to get hurt when he takes his yes back and says they won’t be getting married, so she turns into her old/younger self who learned not to want marriage and love etc.
To sum up what I mean, I saw multiple Brennans on Emily’s face. The happy little girl before she lost her family fading into the broken girl after that, both somehow overlapping with the present Brennan. The Brennan who can turn on the superrational mode and accept what Booth’s saying, claiming they are okay while holding in the other Brennan who breaks down behind the wall.
There’s just something about her confused, uncertain, and finally, sad smile. The combination of all the vulnerability, that’s what allows me to see that.
Basically, nice job, Emily.