I'm told Eva had boasted about sleeping with one of the players, and she was close with many in the dressing room. Jose was aware of the situation and unhappy with Eva polluting the dressing room.
The Swansea game presented an opportunity for Jose to lash out at Eva and consign her to the reserve team so that she would never get too close again with the first team players. Apparently Jose's highhandedness incurred the wrath of few in the dressing room and they started plotting his downfall.