Can I put a different angle on this for you.

My son is 5 and a horror. He is well known for his cheek and bad behaviour wherever we go. He's very small for his age and has the charm to get away with some seriously bad behaviour. The school think he's 'cute' and 'only little' so they do nothing about his behaviour problems and say but oh he's so sweet when I suggest they should.

It won't be 'cute' for either of our children to behave that way when there 10.

So yes, its worrying that they've already had to contact you but a lot more positive than them excusing her behaviour and leaving it to escalate. Try to look at it as positive support rather than critism and make sure the teacher knows its welcomed.