‘Kitty said, “Uthara is one of the two daughters of my mother’s brother’s wife”. How is Kitty's mother related to Uthara’s sister?

Kitty's mother's brother's wife is Kitty's maternal uncle's wife, and Uthara and her sister are her daughters, Kitty's cousins. Their father is the brother of Kitty's mother, so Kitty's mother is the sisters' paternal aunt (bua). Kitty's mother is Uthara's sister's aunt.