In the episode "Deep Breath" what did tu think of Clara's reaction to the Doctor's regeneration?

I think it was the most realistic reaction we've had yet, and I liked how they used parallels with the disguise theme throughout. It seemed a little out of character for Clara to be honest though- she hasn't really seemed to be the judgemental type before and it's like they added it in just because the writers know she has previously lacked character development. Also, she's the one companion out of all that should be used to regeneration, as she's seen all of the Doctor's incarnations. But, I guess Eleven was her doctor and she is going to feel somewhat scared and resenting of the new, older Doctor.