How should I deal with my husband's ex wife?

I've recently joined a roller derby team and we're very new. I'm quite excited about doing it and we've met up a few times for practices. However, my husband's ex wife has joined and although she hasn't come to any practices yet, it's only a matter of time. How should I deal with her when I finally meet her? She became a bit of a nutter when me and her ex ot together, we had to get the police involved at one point, so I can't imagine that she's going to be overly friendly towards me. She's also a lot bigger than I am!!