HI There, My Daughter Who Is 10 Has Been Experiencing

HI there, my daughter who is 10 has been experiencing frequent urination for almost a month now. She has had urine tests and an ultrasound which have come out clear of any problems. She urinates sometimes every 15 minutes to 40 minutes. She recently has been getting up in the morning with painful urine or burning sensation but then during the day there is no burning. So I have to wake her up at might to urinate to stop this problem. She is also a very anxious child. I have been doing some reading and she seems to have symptoms of pollakiuria. However pollakiuria does not have any signs of burning. what are your thoughts on this?