It is difficult to be sure exactly what is causing this change in behaviour, but it is common for children to go through periods like this. The problem is that if you let her stay up longer or take her out of her cot, she will get used to this new routine and even start playing up more. It is probably best to apply the controlled crying method here with you leaving her to cry for longer and longer periods before going to her. It is hard on the nerves and takes a lot of determination , but she will tire herself out and eventually go to sleep.
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