DD (10.6) has recently started getting moody, taking the huff over nothing then crying.
When I ask her to tell me why she's upset, she denies being upset, says she's not crying as she's sobbing into her pillow, and refuses to talk to me.
I feel I'm being manipulated by her, to get a reaction. I end up getting fed up being stonewalled, and telling her that if she won't talk to me I'll just go away. Then she sobs even harder. 
She never does this with DH.
What can I do?