The possibilities are endless even if she never gets around to actually participating in front of you
1. As has been mentioned, simply chatting with her about what you love about the rivalry between women and how and why you love an evenly matched catfight, watching some of your favourite catfights
2. Spotting other women/couples and asking her to trash talk about the woman
3. Spotting other women/couples here on FCF and on Fetlife. Whilst it might be impossible to actually meet, having an actual female participate in back and forth online would be a real turn on for me - I would call out posers immediately if I had a real woman willing to indulge me
4. If you did come across another willing couple that did not want a real catfight but happy to have some catty fun for everyone's enjoyment, you could have fun with fun scenarios, pose for pictures, fancy dress, engage in trash talk etc