וַתַּ֣הַר ע֔וֹד וַתֵּ֕לֶד בִּלְהָ֖ה שִׁפְחַ֣ת רָחֵ֑ל בֵּ֥ן שֵׁנִ֖י לְיַעֲקֹֽב׃
라헬의 시녀 빌하가 다시 잉태하여 둘째 아들을 야곱에게 낳으매
Haamek Davar on Genesis
Rochel’s handmaid. This is reiterated here to indicate that unlike Hagar, she continued to treat her mistress with respect even after she conceived.