Weng appeared in a total of 19 Fed Cup ties for the Chinese Taipei team and represented her country in several multi-sport competitions.

She won a Gold medal at the 1998 Asian Games in the team event.

At the 2000 Summer Olympics, she and Janet Lee represented Chinese Taipei in the doubles, where they were beaten in the first round by Ukraine's pairing.

[1] They also partnered together at the 2001 Summer Universiade to win a Bronze medal.

She played her last Fed Cup tie in 2002, which was her final year on tour.