Stressed over constipation

My daughter is coming to 2yrs. Since birth she always have issue w/ constipation. She can go up to 5 days without BO. Paed would give fleet and she would pass motion and back to square one thereafter. Ive tried all remedies, massages of all sort, veges (but she hate fruits) and even laxatives! Im soo stressed out over this when it comes to the 3rd day. She seem as normal, no bloatedness or tummy discomfort. Any advice?