They did have a huge ongoing (passive aggressive?) fight, which is why the two actresses could not be in the same room to film a scene together for (more than) 60 consecutive episodes. It was just easier to give them separate sides of the lot and pretend that everything was alright, than to see what would happen if these women got within 5 feet of each other.
Even their final scene 'together' was just a hack job. They really hated each other.