If you want to keep her back, you can get a psych evaluation (sounds scary but it's just to basically put the wind up them to let you do what's best for your DD) and they will confirm that she needs an extra year. So many kids do, and there is nothing wrong with it. It's funny how things differ state to state. Here in Vic a lot of parents keep back children so their child turns 6 the year they start prep. Some even turn 7. Emotional wellbeing is more important, and you don't need the stress of worrying if she's coping when it could impact on her learning and social integration. You are doing a great job!

It's times like this I wish we had a national education system rather than state to state.