回复：急问:家庭地址被别人用,对我们自己的申请有害吗?

I do not think this will have any negative effects on your future life, especially on GC application. People change address all the time in U.S. Your 中国同事 just use your address for communication, that is very common in U.S. and will not affect you. If she used your address to do some illegal things (for example sell drug), you would have trouble about that.