Crying in Kindergarten

Gillian's teacher has been out since Christmas vacation and I thought things were going okay with the substitutes but all of a sudden I'm getting reports from school about uncontrollable crying. She's being really hard on herself if her work is not perfect. Her teacher is saying not just crying but temper tantrum fits and it's become a complete disruption of the class. I really don't know what to do. As a teacher myself I'm horrified and I've talked to her about it. She can't give me a good reason why. I know she's having a hard time because her teacher is out. They've had several different subs and she is not knowing what to expect when she walks in the door to school. It's not anyone persons fault but I feel bad and now we have to start taking away privileges. She can't continue like this and I've got to break this habit. She can't go to first grade throwing fits. They'll send her to the office I feel like she's been robbed of her kindergarten experience! She was so excited to go to school and now when I walk into school to get her I'm always worried about what I'm going to hear about how her day went. This final sub is here until the end of the year and the other teacher next door has been keeping an eye on her and has been in contact with me. I'm keeping my fingers crossed that this year ends well. But even with all this going on she leaves everyday with a smile on her face and a positive attitude. This photo was this morning :) This turned into more of a vent but I know she can do it! Now she just has to believe in herself.