I'm going to disagree a bit with some of the posts here. Yes, there are individual habits and so on. Yes, you have to increase her water and her fiber. Yes, color is important. But a hard (even if it's not "too hard to pass"), nugget-type stool is not ideal. Just because she's not complaining doesn't mean anything - she may not know this is a problem. It should be softer and more S-shaped. So her stools are, in part, a reflection of her diet.
You can't tell from whether someone is straining or going every day whether there is something going on inside. She may well have the start of that dreaded layer of "sludge" lining the colon walls that is so common in American diets. A piece of fruit or a bowl of fiber cereal isn't enough to undo that.
I work in food science and I have to tell you that even people who think they eat enough fruit and vegetables just don't get what they need. We've got to have soluble and insoluble fiber in the same diet, and most people don't get that. In fact, most fiber products don't contain it. So while I agree that giving a child (or anyone) laxatives over a period of time is a bad idea, I would urge you to consider a better alternative for her. There are patented children's supplements with no warning labels and with the FDA Good Manufacturing Practices certification. I would steer away from products sold in supermarkets especially after the recent legal actions against places like Whole Foods and GNC for selling products that aren't properly labeled or manufactured, and which often don't even contain what the labels said they do.