I think you should talk to your instructor about it nonetheless, and the others in the dojo should do it as well. I think the message will sink if a lot of people complain about it. Then he might see that it is generally seen as a significant problem, that it is bothering not only the woman in question but also the others. I think this should be dealt with as quickly and directly as possible since it would probably affect the atmosphere of the dojo in the long run, as well as the students' respect for their instructor. Good luck, hope you get it solved!