My suggestion to you would be to keep her as active as possible. Enroll her in activites she enjoys such as swimming, gymnastics, soccer, etc... And offer healthy foods. Try to make well balanced meals and talk to her about nutrition and the importance of having a healthy lifestyle. My daughter is 5, 45inches and 64lbs and is on the same track as yours and I am just trying to keep her active and hope she will eventually out grow it. I hope that helps a little.
Please state your daughter's age so I am able to answer your question. Thank you.