Well, it's a female dragon with boobs, so Dragon Girl is technically valid. Clearly not a human and don't have humanly face, so not a monster girl but a furry. post #113417 may also serve as a good reference for these cases.
Going by the description of dragon girl (According to the tag) it should fall under dragon + 1girl tag. It does not count as dragon girl because it is an actual dragon and not an humanoid dragon.