Eventually! She went through a very traumatic experience, so if she just bounced back immediately it wouldn't seem real. I can understand her being upset with Callie, but I also feel bad for Callie because she was just trying to save Arizona! :(
I am very hopeful that Arizona will be back to her bright and cheerful self. She showed a glimpse of hope in the past episode. I think they wanted to portray how trauma can affect someone so greatly and how they can work through the life-changing event.
This is suppose to be there year of love according to Shondra Rhimes so I think that yes the cheerful Arizona will come back later in the season. I think we saw a glimpse of her in the last episode when she got her prosthetic.
It is going to take time. And maybe some help from the new doc and also secretly from Alex but I really do believe something will happen and she will tell someone about how bad it was once but how she was able to live while others were not so lucky.