Our expert says:
Maybe she thought she could get away with it, but its rather insulting to you to have assumed that.
There's of course no need to hurt her, and that wouldn't be useful anyway. She needs to sit down for a long serious talking with. Explain that because she has lied in such a serious way, you now don't know when it is safe to believe her. And by pretending to have a medical emergency, she has made it hard to know whether she's really in trouble or just pretending ( maybe tell her the old folk story of the Boy Who Cried Wolf - sometime she might have an attack of bad health and nobody might believe her ).
Also she needs to understand that playing with her friends is important and nice, but NOT more important than her safety or even your convenience.
As Anon says, she needs to learn that when you do bad things for selfish reasons, there are consequences. In future she will go home earlier when it happens to suit you, and not when she fancies. She spends time with her friends when at school, and can plan WITH YOU to visit them or have them visit her, on the weekends.
Again, as Anon says, be firm, but not angry.
And for penalties, I am one of those who don't recommend hidings - they're too emotionally satisfying for some parents, and they teach the child that it is OK, if you're powerful enough, to use violence against others to get what you want - and surely that is not what we'd want her to learn.
But yes, grounding with chores at home for a week or two, and at least a week of no cellphone. These days, most kids seem as though they would rather be dipped in boiling oil than be without the cell-phone for even a day. So, as a suitable punishment, that is probably the only real advantage to children having cell-phones.
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