cousin-niece

First cousin's daughter.

My cousin-niece is a good girl.

half-niece

Half-sibling's daughter.

My half-niece is a good person.

half-niece

Half-sibling's daughter.

Half-niece.

step-great-niece

1. The granddaughter of one's stepsibling.
2. The stepgranddaughter of one's sibling.

My step-great-niece is a good person.

niece-by-marriage

Spouse's niece.

My niece-by-marriage is a good person.

niece-by-marriage

Niece-in-law (only spouse's niece).

My niece-by-marriage is a good person.

half-first cousin-niece

Half-first cousin's daughter.

My half-first cousin-niece is a good girl.