No, the word girl in Dutch (and German) is neuter, as hungover mentioned before. De is for feminine and masculine nouns, while het is for neuter nouns. I don't know why the word for girl is neuter in Dutch and German, but they are so you use het.
If a word has "je" or "tje" behind it (meisje, muisje, jongetje, kastje) it a small version of an object, so it gets "het" instead of "de".
Example: De jongen(the boy). Het kleine jongetje (the little boy).