Who was Abishag in the Bible

Abishag was a shunammite virgin and the nurse of King David whose primary job was to sleep next to the king and keep him warm.
So they searched for a beautiful girl throughout all the territory of Israel, and
found Abishag the Shunammite, and brought her to the king. 1 KINGS 1:3 NASB
The Bible is a foreign book to most people. Even for those who grew up reading the Bible and attending church regularly, the Bible captures stories and messages from a different culture. The Middle Eastern
traditions are very different than the twenty-first-century Western culture that many Christians live in. Because of this profound cultural difference, Abishag’s story strikes us as unusual.
Abigshag was a beautiful young woman who was pressed into service of an elderly King David. As he aged, he had trouble staying warm at night no matter how many blankets they put on his bed. Rather than risk smothering their king, his servants enlisted Abishag – a Shunammite
virgin. Her primary job was to sleep next to the king and keep him warm. Though she slept in the king’s bed, Abishag remained a virgin.
Abishag’s closeness to the king put her in the center of controversy after David died. Though Solomon had become king, his brother Abiathar had his own eyes on the crown and made a play for power by
requesting Abishag’s hand in marriage. Solomon would not allow the union, and because Solomon interpreted the request as a political threat, he had Abiathar put to death the same day.
As king, David had the right to conscript any man or woman into his service. The prophet Samuel had warned the people of a king’s power. He said, “These will be the ways of the king who will reign over you: he will take your sons and appoint them to his chariots and to be his horsemen. He will take your daughters to be perfumers and cooks and bakers. He will take the best of your fields and vineyards and olive orchards and give them to his courtiers.
He will take your male and female slaves, and the best of your cattle and donkeys, and put them to his work. He will take onetenth of your flocks, and you shall be his slaves” (1 Samuel 8:11–17 NRSV).