Thank you for your query on Healthcare Magic.
is very uncommon in grown up children.
But the following things to be ruled out by proper evaluation and investigations.
1. Urinary tract
2. Urge and overflow incontinence
3. Psychological stress factors
4. Diabetes Mellitus
Therefore I advise you to investigate her with complete urine examination, urine for culture and sensitivity, urine for sugar, blood sugar, and ultrasound abdomen and pelvis to rule out the above problems.
And she needs examination and interview by a Pediatrician to look for any psychological issues, problems.
Therefore consult a Pediatrician
for examination and investigations.
Hope I have answered your query.