My 20 yr old daughter is constipated will a laxative help her she has'nt had a movement in 2 days and is urinating frequently more than usual?

Let's define problem: Doctors define constipation as stools less frequently than once every 3-4 days. Patients feel they are "constipated" when passing hard or small volume stool, or feel full & bloated. Your daughter can certainly try a mild laxative, but have her seek evaluation if she has known colitis, ongoing symptoms, or signs of abdominal distension, tenderness, increasing pain, fever, blood in stool.