100% that. It was a big deal and I think she just let the pressure get to her a bit and was threading that fine line between trying to stay calm and relaxed and yet knowing the Oscar was a solid possibility, which accounts for her, at times, rather theatrical and OTT approach to campaigning.
I reckon she'll be fine now it's all over and done with and will get back to normal.
Agreed. I think her reactions were just a mixture of nerves, relief and then joy. Also, she's carried the film on her own an such with regards to award wins, aside from at the Golden Globes, so I imagine that added more pressure. If she didn't win, than the film would barely have been recognised.