WNBL Timms debuted in the WNBL in 1984 with the
Bulleen Boomers. She joined the
Nunawading Spectres in 1985 and played six seasons for the club. Between 1991 and 1994, she played for the
Perth Breakers. In 1995 and 1996, she played for the
Sydney Flames. For the
1998–99 WNBL season, she returned to the Bulleen Boomers. She won four
WNBL championships with Nunawading and one with Perth.
WNBA At the onset of the WNBA in 1997, Timms was assigned to the
Phoenix Mercury in the initial player allocation. Her debut game was played on June 22, 1997 in a 76–59 win over the
Charlotte Sting where she recorded 8 points, 6 rebounds, 6 assists and 2 steals. Timms had a very dominant rookie season with averages of 12.1 points, 3.7 rebounds, 5.0 assists and 2.6 steals per game. The Mercury finished with a 16–12 record and made the playoffs but were eliminated in the semi-finals by the
New York Liberty. For the 1998 season, Timms had a drop in all of her season averages except for assists. Recording a lower average in minutes played, points, rebounds and steals than her previous season. The Mercury was still able to complete the season with a 19–11 record and reach the
finals but lost to the
Houston Comets. Timms came within inches of giving the Mercury their first title; with the Mercury up 1–0 and needing only one more win for the championship, and Game Two tied at 66 with three seconds to go, Timms took a three-point shot that bounced off the rim's back. Ultimately, the Comets won that game 74–69 in overtime, and then the championship in Game Three. The Mercury reached the playoffs with a 20–12 record in the 1998 season, but Timms only played 8 games that season and sat out of the playoffs as the Mercury lost in the semi-finals to the
Los Angeles Sparks. Timms bounced back and played more games in the 2001 season, playing in 21 games and averaging more points and assists than the previous season. But 2001 saw the Mercury have their worst record so far of 13–19. Timms' final WNBA game was played on August 14, 2001 in a 56–38 win over the
Houston Comets where she recorded 10 points, 4 assists and 2 rebounds. That very same day (as it was the final game of the season and the Mercury were officially not making the playoffs), Timms announced her retirement and almost immediately joined the Mercury's
television broadcasting crew, a job which she held only for that season. On August 7, 2002, her number 7 jersey became the first to be retired by the Phoenix Mercury, and only the second jersey ever retired by the WNBA (the first being
Kim Perrot). Upon her retirement, she was the Mercury's career leader in assists.
Europe Timms played five seasons in Europe. Her first came in 1989–90 with German team Lotus Munich. She returned to Lotus Munich in 1992–93, played for Firenze Basket in Italy in 1993–94, and then played two seasons for
BTV Wuppertal between 1995 and 1997. She won the
FIBA Women's European Champions Cup with Wuppertal in
1996.
National team Timms made 264 appearances for the
Australian national team. She participated in four World Championships (1986, 1990, 1994, 1998) and three Olympic Games (1988, 1996, 2000). She won Olympic bronze and silver medals (1996, 2000) and a World Championship bronze medal (1998). She was captain of the Olympic team in 2000. ==Coaching career==