i wouldn't give her laxative on daily basis. my 5 year old has always been constipated. the things that help are cantalopue (sp?), watermellon, raisins, prune juice, beans. i also limit rice and banana. as for strawberries and apples, that's odd. i still give her both of those.
our ped had also recommended we give her a liquid laxative, don't remember what it was but once he said you need to adjust the dose pretty much every few days as sometimes it'd be too much sometimes to little i decided against it. she still doesn't go every day more like once in a couple of days but better than before when she'd go at the most 2 weeks at a time. which was very painful.
good luck