Since the poop is soft and she's not fussy or straining, that's actually a reassuring sign, soft poop that passes easily is generally considered normal, even if the ball shape looks a little unusual. A friend of mine went through something similar when she switched her baby to cow's milk around 13 months, and she said the ball-shaped stools sorted themselves out after the gut adjusted. The key things to watch are whether the balls are getting harder over time, whether your baby seems uncomfortable passing them, or if there's any mucus or unusual colour, those would be the signs worth paying closer attention to. Since it's been almost a week of this pattern, it's always worth a quick check with your PD just to be sure, especially to rule out any dietary or digestive reason behind it.