Toddler poop problems

So we recently moved from Canada to the States and my 2 and a half year old seems to be having digestive issues! She will go five days before pooping... this is the third time it’s occurred now! I’ve upped her fruit and veggie intake, upped her water intake, giving her fiber supplements, reducing dairy and have her on stool softeners after day 3.... what more can I do to help nature take its course? I’m nervous to go to the doctor as I assume it’ll just be a “you’re doing all you can, let nature take its course” and then I’ve just gone out for nothing... thoughts? Suggestions?