Hi, it depends on how often she is on her toes and whether she is able to place her feet flat on the ground when she stands. There are some conditions in which children would tip-toe walk. But as you have seen a paed, she would have ruled those out. In my experience as a Paediatric physiotherapist, children who have been tip-toeing as long as your child will have some degree of calf muscle tightness and will need the calf muscles to be stretched. There are activities you can do with your child to encourage feet flat on the ground. A pair of stiff higher cut shoes would help as well. It might be useful to have a Paediatric physiotherapist assess your child and teach you the exercises you can do with him.
Hope that helped!