Who was the lady Boleyn in the Tower with Anne whom she did not like?

The Lady Boleyn who served Anne in the Tower in May 1536 was Elizabeth Boleyn (née Wood), wife of Thomas Boleyn’s younger brother, Sir James Boleyn of Blickling Hall, and therefore Anne’s aunt. Sir James Boleyn was a supporter of the Lady Mary. You can read about Anne's attendants in the Tower in my post - https://www.theanneboleynfiles.com/cruelly-handled-anne-boleyn-in-the-tower/5260/