niece

所有的侄女不管是怎么样的都是niece 直接侄女~

通常说 niece 便算了，要说明一下就是 on the father's side。

说实话我也不能每次记住这些家庭关系的确切称谓。喂鸡百科里有个条目叫“Nephew and niece”，其中详细解释了各类名称：
Nephew – son of one's brother/sister (and his/her spouse).
Niece – daughter of one's sister/brother (and her/his spouse).
Nibling – uncommon gender-neutral term for niece or nephew.
Half-nephew – son of one's half-brother/half-sister.
Half-niece – daughter of one's half-brother/half-sister.
Nephew-in-law – son of one's sister-in-law/brother-in-law; husband of one's niece.
Niece-in-law – daughter of one's sister-in-law/brother-in-law; wife of one's nephew.
Step-nephew – son of one's stepbrother/sister, or stepson of one's brother/sister, or stepson of one's stepbrother/stepsister.
Step-niece – daughter of one's stepbrother/sister, or stepdaughter of one's brother/sister, or stepdaughter of one's stepbrother/stepsister.
Half-nephew-in-law – son of one's wife/husband's half-brother/half-sister; husband of one's half-niece.
Half-niece-in-law – daughter of one's wife/husband's half-brother/half-sister; wife of one's half-nephew.
Step-nephew-in-law – son of one's wife/husband's stepbrother/stepsister; husband of one's step-niece.
Step-niece-in-law – daughter of one's wife/husband's stepbrother/stepsister; wife of one's step-nephew.
Great-nephew (also called "grand nephew") – son of one's nephew/niece, grandson of one's sister/brother.
Great-niece (also called "grand niece") – daughter of one's nephew/niece, granddaughter of one's sister/brother.
Half-great-nephew – son of one's half-nephew/niece.
Half-great-niece – daughter of one's half-nephew/niece.
Cousin-nephew – son of one's first cousin (i.e., a first-cousin-once-removed who is male and in the younger generation).
Cousin-niece – daughter of one's first cousin (i.e., a first-cousin-once-removed who is female and in the younger generation).
因此，堂侄女应该叫niece。

一般不会特别描述，就用【niece】，你想想连兄弟(Brother)，都不区分哥哥、弟弟；
还怎么会去在乎一个侄女还是外甥女？
不过非要详细描述的话，也可以这样：简单一点是【niece paternally】

另外，看你对这个感兴趣，再免费送你一个知识点吧：
这个问题虽然简单，我也是看到英语才想明白的，你要是让中国人汉译英，估计很多人都会一脸茫然。(我也是)
你知道【外戚】应该怎么用英语说吗？
很简单： 【in-laws】。
如果经常看英语影视剧的话，估计总能看到丈母娘、岳父之类的吧，即：father-in-law, mother-in-law；那么按照这个逻辑，所有的没有直接血缘关系，而是由于配偶发生的亲属关系的人，都应该成为外戚，也就是上面的【in-laws】复数表示不是一个人。

以后你可以说你是戴安娜王妃的堂侄女达芙妮·斯宾塞的朋友。