Musical Project: Best Supporting Actress 2012: Sally Field - Lincoln

It's not a secret that I didn't enjoy Lincoln very much. I have seen it four times yet and I hope I won't have to watch it again.
The fourth time I've been watching it was because of this review and something strange happened to me. The three times before made me sure I have a resistant opinion about Field's performance, which was not very good to her. But I don't know how, I realized it's not actually as bad, as it seemed to me. 

The biggest problem I had (and still have) with this performance is the overacting. Field's portrayal of Molly Lincoln is actually full of inconsistence. On the first hand we have perfectly acted scenes, on the other hand there are scenes so overacted, that they can hardly be believable. 

If you take for instance her subtle scenes, they are the the proof of Field's ability to be a wonderful actress. The scene, in which she cries about her dead son and the following scene at the Grand Reception are really great. In bot of them she superbly builds her character and shows off the emotions.
She also has some brief moments at the councils. She handles them well enough, but the truth is that she doesn't have a lot to do in them. She only delivers one, or two lines at the most, but mostly it's about her look.
On the other side we have scenes, where she is completely unrealistic. For example the scene of her emotional outburst, which ridiculously became her Oscar clip, is extremely overacted. I didn't believe a single line she said. Or there is a scene at the opera, in which she moves and acts as she was told to, but it never seemed natural to me.
When I think about these mistakes, I used to blame Field for her. But the last time I've watched the film I realize that it's the screenplay and the direction who's to blame here. I don't absolutely understand the praises given to the screenplay. The lines are extremely unnatural and the direction failed to help it. But it's even the failure of Field, so why I blame Spielberg so much? Because he not only fails to help the factitiousness, he seems to support it at some moments. But that's another story.
The best scene of Field's performance would be the above-mentioned scene of the crying.
The chances of winning an Oscar: The fight was down to her and Hathaway. But we all knew Field's not going to happen...