I was lucky enough to be romantically involved with a couple of DWW girls and was friends with another back in its heyday so got the inside track on which rivalries were real.
There was a natural rivalry between the Czech girls and the Hungarian girls, similar to an English and Scottish woman fighting in competition, but they didn't speak each other's language so it was never a clash of personalities with any of them.
The Hungarian girls seemed to get along with one another on the most part, it was a smaller operation and they were a bit further dispersed around Hungary. The majority of the Czech girls all lived in the same town and knew each other and there were some personality clashes, and a definite clique led by Eva who was something of a Queen Bee. Denise was not invited into the clique and disliked Eva. Eva also had a brief falling out with Jana N but they had a boxing match at an event and made up after that (Eva won and Jana spent the next four days at the event basically as her lady-in-waiting, always at her side, which was interesting to watch).
Barbara wasn't popular either and seemed to be the one girl who could get under Luzia's skin.
Laila was another who was not popular in the group, and riled Antonia in particular. Antonia actually went as far as to request a wrestling rematch with her after a catfight defeat, believing that style suited her better.
Laila not only won that match also but sat on her face at the end and refused to get off until Antonia had told her she was better. When she was finally let up Antonia threatened to punch her in the face.
The other point of interest involved Daniella (I think), who started dating Tiffany's boyfriend after they had split up and were then paired in a match together.
But the legendary rivalry was Ingrid and Nicole. This was a bit before my time but the legend lived on about how they had fallen out but the younger, smaller Ingrid had settled things with Nicole decisively in her favour.
I am still in touch with one of my exes but she has nothing to do with Foxycombat or FightingDolls. However, I know from her that Vera and Gina are not friends.