My sisters urine smells bad

My sisters 15 yrs and after she uses the bathroom (just a pee) it honestly smells so bad, me and mum have asked her if she's sore/itchy etc down there. but she says she hasn't been. It smells every time, and worse in the morning when she wakes up, and I literally gag. She will be seeing the doctor in a few days, but just wanted ideas on what it could be x

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