Our expert says:
She is 10 years old and still frantic about a blanky ? How immature ! This is not normal or necessarily healthy, and leaves her vulnerable if it should get lost. Just taking it away, though, will only upset her. Talk calmly with her about how this is something babies use to comfort themselves, and kids give it up after a couple of years. Praise her for being big and more clever now, so that as a growing woman she won't need the blanky any more. Encourage her to put it aside --- somewhere safe, so she knows it is there, and can carry the sense of confidence and security with her, and not need the blanky to carry it in. Maybe i would be wel for her to see a child psychologist / child psychiatrist to check her out and to help make this more easy for her.
Similarly with her having been cheeky and unhelpful --- have clear simple rules, and rewards, including praise, when she does this properly and keeps to the rules, and when she does not, she loses points towards things she wants, or loses privileges for a time
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