brother's wife
娌 centers on a specific family relationship: a brother's wife, i.e., a sister-in-law.
娌 combines 女 (woman) with 里, which likely contributes the sound. The character was created to represent a brother's wife.
A woman 女 beside 里, which can be thought of as a village or home. Picture the woman who joins the family through marriage to your brother, becoming the sister-in-law in your household.
For リ, imagine your brother's wife named Lee: Lee -> リ, and she is the woman 女 who is now part of the family 里.