Difficult Colleague Deliberately Winding Me Up - Help!?

I share an office with a woman. Wwe had a major issue last year re. her overuse of pungent perfume that caused me sinus problems etc. It took me ages to get boss to take my complaint seriously. My dad died suddenly then & while I was on hols in summer, colleague filed a grievance procedure against me for harrment, said she felt "under scrutiny"because I objected to her perfume. She didn't press ahead, as there was no basis for her false claim. We now barely speak except workrelated. Lately though, she is interrupting my chats with other colleagues, joining in even if I'm just bantering ie not work related. It's doing my head in, and I know she's doing it to wind me up. I don't react, am cool as cuber but boiling inside. Should I continue to ignore her or confront her about her rudeness? She is listening to every word I utter to others, then joining in. I feel studied, monitored, watched. I really hate this person due to all the hle she caused me & wish she'd just ignore me!