Hello. DD is an only child at the moment, she is very confident and incredibly funy. She likes to make people laugh, and is the kind of person who will try and diffuse a situation, either by humour, or by changing the subject and keeping on at it like a dog with a bone 
She cries easily, and often. Possibly more than most children her age. Particularly when she doesnt get her own way, or when she feels she has been treated unfairly.
However she keeps things to herself. She just doesn't discuss them. The most recent example is the fact that she chose to give up her dummies recently. She was incredibly proud of herself, and spoke about her achievement a lot. When she went to nursery the next day i told her carers, so they could reinforce her bravely and talk to her about how she is feeling. But whenever they asked her what big thing she had done the night before..etc etc, she pretended she hd no idea what they were talking about. And in group time, she wouldn't expand on what the carers were saying. When i asked her about it, she said it was because it was a "secret" and she only told her best friend.
I had the talk with her about secrets and that they shouldn't be kept etc, but she said "i am not keeping secrets from you mummy, i am just not telling nursery about my dummies"
this is not an isolated incident either. Is this just her character, or should I be helping her to open up in some way, and if so, how?