What relationship does jāratihā indicate in the phrase wa-jāratihā Umm al-Rabāb?

Imruʾ al-Qays: Earlier Loves, Fragrance, and Dārat Juljul (Verses 7–12)

• Umm al-Rabāb is her sister
• Umm al-Rabāb is Umm al-Ḥuwayrith’s neighbor
• She is enslaved to her
• She is her mother