THE woman who will cast America's vote on the 2000 Olympics bids has vowed to ignore Congress' attempt to influence her decision. Anita DeFrantz, a former Olympian and an executive board member of the International Olympic Committee, said she would remain independent of any political pressure. Ms DeFrantz, who is also the influential president of the US Amateur Athletic Foundation, said: ''I have taken an oath to remain free of political influence and that's what I will do.'' She testified at a Senate committee hearing last month urging members not to pass a resolution protesting against Beijing's Olympics bid. Although a Senate vote has yet to be taken, the House of Representatives last week passed a motion calling for the Chinese bid to be rejected. When asked whether she had already made up her mind, Ms DeFrantz said she still had to visit one venue - Istanbul. She added that it would be ''inappropriate'' to make a decision until she had considered the merit of every bid. ''And my votes are by secret ballot and I would not disclose them now or at any time,'' she said. She said the House had the right to express its opinion. But she regretted she had not had the chance to put her case to representatives before the resolution was passed.