The investigation that led authorities eventually to question Mr. Sweat began when Ms. Mitchell, an industrial training supervisor, wrote in January to prison Superintendent Steven Racette and told him a female co-worker was spreading rumors that she was in an intimate relationship with Mr. Sweat, according to a person familiar with the investigation.
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Mr. Sweat told investigators that Ms. Mitchell had never gotten along with either the female co-worker who allegedly spread the rumors or a male supervisor. He also told investigators that this other female worker “hated” him.
Mr. Sweat told the investigators there were rumors that the female worker and the male supervisor were in a relationship.
http://www.wsj.com/articles/escaped-killer-valued-his-job-at-prison-tailor-shop-1434401107
BBM^^
So this would be allegations of Another Female Employee in the Tailor Shop who was having a relationship with a Male Supervisor.
It is she who would have been the female that was allegedly spreading rumors about Tillie that led Tillie to write to the Superintendent.