Your niece's husband's daughter is also your niece's daughter and therefore she is your great niece. You are her great aunt or great uncle, depending on your sex.
If your niece's husband's daughter is from a previous marriage, and so not also your niece's daughter, you are not related to her. Of course, if your niece adopts her, then she is your adopted great niece.
If your niece married her husband while his daughter was very young and everyone has been treating her as your niece's daughter, then you can call her your great niece if you want, but that does not change the fact that you have no common ancestors and therefore are not related to each other.
Some nieces of sisters are related to each other and some are not. Your niece is the daughter of your brother or sister (your siblings). If you have more than two siblings and at least two of them have daughters, those daughters are your nieces and they are first cousins to each other. You can also have a niece who is the daughter of a sibling of your spouse. If two sisters have nieces who are daughters of their spouse's siblings, those nieces are not related to each other (unless the spouses are related to each other, as when two brothers marry two sisters)
Grand niece.
The children of your husband's siblings are your nieces or nephews. Their children are your great-nieces or great-nephews.
Great-niece.
Your husband's sister's kids are referred to as your nieces and nephews by marriage. More specifically, you can call them your "nieces" if they are girls and "nephews" if they are boys.
your 2nd niece...!
Your daughter and your niece's child are 1st cousins once removed.
If you wanted to say "nieces" as a plural, such as "I have two nieces", then it wouldn't need an apostrophe. If you wanted to say something like "My niece's teddybear", showing singular possession, then you would need an apostrophe. The word nieces is a plural noun. If you want to use it as a plural possessive noun then put an apostrophe at the end - nieces' My nieces' husbands are both doctors.
My niece's daughter is my great niece.
she never retierd but her daughters and nieces help her in her upholstery shop when her husbands died
Your mother's sister-in-law is either the wife of her brother (your uncle), or your father's sister (your aunt). The niece of your uncle's wife is not related to you, unless she is you, your sister, or a girl cousin who is the daughter of another of your mother's brothers or sisters. The niece of your father's sister is you, your sister, or the daughter of another of your father's brother's or sisters. If your father's sister is married, she may have nieces who are the daughters of her husband's brothers or sisters. Those nieces are not related to you.
No he did not. I am one of his grand nieces. He had one daughter.