4yo dd had a really bad drop off at preschool a couple of months ago. Until then, she was quite happy, but that day her key worker and another teacher she likes were both away. I left her with another teacher and altho she was a bit tearful, I didn't think twice. At pick up, I asked if she'd settled fairly quickly and the teacher said that she'd decided that dd wasn't upset, but was cross, so she'd left her to cry. When another teacher came to distract dd, the first teacher said, no we're ignoring dd as she's cross.
When I picked her up, she'd had a good morning, but every single drop off since then has been a nightmare of clinging, screaming and saying she's scared of the teacher who left her crying. Its now spread into home life too - when I went to a friend's birthday recently, I left dd with her Dad and big sister and she got herself into such a state that she vomited.
I'm exhausted and finding it emotionally draining. What can I do to improve things? We've tried sticker chart, but she gets even more upset if she cries and therefore doesn't get a sticker....