In 1985 she was hired by WKBW-TV sports director Jerry Azar as a part-time sports producer. She later moved into an on-camera role reporting on the Buffalo Sabres. During her tenure at Channel 7, Brenon was credited with breaking the story about Clint Malarchuk's obsessive compulsive disorder.
Brenon married Boston Globe hockey writer Kevin Paul DuPont in August 1994. She resigned from Channel 7 shortly thereafter to move to Boston with her husband.
In 1995, Brenon began writing for The Boston Globe. She was also hired to serve as one of six rotating anchors for NewSport's Scoreboard Central.
In September 1995, she was hired by NESN to host the network's Boston Bruins telecasts. She would also do feature pieces for its Front Row program. On July 31, 1997, Brenon was fired by NESN. However, she returned to her job in September after the United States Department of Labor ordered the network to rehire her with back pay under the Family Leave Act, which provides job protection during maternity. Brenon did not return for the 1998–99 Bruins season, as her position of between-periods reporter was eliminated.