If she goes to bed @8 when does she wake up? She may be getting enough night sleep and the nap could be too long. I worked in a day care and for some 3/4 year olds we had to do 30 min nap or no nap as it cut into night sleep. Id def try cutting the nap down to an hr and if that doesnt help then down to 30 mins and if your still having problems at bedtime just cut out the nap then maybe move bedtime a little earlier or keep it the same depends on her tiredness so she just sleeps all night.
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