My niece iz 3 years old. Ever since she was about 1 1/2 ive noticed she's had a bladder problem. She's potty trained and has been for a sometime but when she gets upset she urinated on herself. She also recently started wetting the bed. Im not sure if its stress related or what. My sister (her mom) had a stroke about 5-6 weeks ago and prior to she was accustomed to being with her mom everyday. She would spend the night at my house and I would never have this problem. Even for times of a whole week- 2 weeks at a time. Should I have her medically &/or mentally evaluated??