She hates Butcher but is also having a sexual relationship with him and cheating on her husband. She’s got a picture of her family on her desk showing her husband and children. She first met Butcher in 2001 when she and the army worked together to bomb a whole village in Afghanistan.
Silver Kincaid got help from her to leave the G-men, Rayner used her as a spy. This could have been fatal to the Boys so Butcher threatened to kill her family including her while having sex.