Pretty normal to have explosive poo that ends up all the way up the babies back and leaking out of the sides of nappies, as far as I can remember anyway, isn't it just the babies guts getting used to milk.
If she is exclusively bf, then there is nothing to worry about. Different babies just poo differently. My ds was pretty textbook and my dd only poo'd once every 7-10 days. We saved a lot on nappies!!! I ate completely normal diet which in my case included lots of garlic and spicy food. Nothing had any effect on either of them.