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just call her by her first name, she is no relation to you.
Your mom's elder sister is your aunt; the son of your aunt is your cousin, and the daughter of your cousin is your cousin once removed.
Your mother's elder sister's son is called your cousin.
Your brother's wife is your sister-in-law.
You would call your mother's sister an aunt.
sister in law
noona for elder sister 누나- that is how you right it
I believe it is your cousin-twice-removed. Definitely your cousin-once-removed's daughter.
In Malayalam, 'sister' means 'Sahodhari'. (Chechy = elder sister, Anujathy = younger sister)
Sister-in-Law
sister in law
Sister In law