She would be your cousin.
2nd cousin
A Great half uncle.
Your mom's uncle's daughter is your mothers first cousin. Their son would be your second cousin.
Daughter hates mothers should she send mothers day card to daughter
Your daughter is your brother's niece. Your brother is your daughter's uncle
Your brother's daughter has a daughter? That is a great niece.
Your mother's husband is your father. His father-in-law is your mother's father, your grandfather. Your grandfather's son is your mother's brother, and your uncle. Your uncle's daughter is your first cousin.
In Farsi, you would say "amoo" for mother's brother.
brother
Your brother's daughter is your niece. Her daughter is your great niece.
Your brother's daughter and your daughter are first cousins to each other. Your brother's daughter and your daughter's daughter (your granddaughter) are first cousins, once removed, to each other.
Your brother or sister's daughter is called 'your niece.'
Your brother's sister is your daughter's aunt, and your daughter is your brother's, and his sister's, niece.