Claudia Christian never fought with the director. She had problems with contract renewal in light of commitments she made when told that B5 would end after the fourth season. In the end, they could not be resolved to her satisfaction, so she left the series.

That said, I'm glad she did. I loved the character beyond belief, and am pretty sure I'd have seriously blown a fuse if she'd hooked up with Byron after the Marcus debacle, as she was "supposed" to do.