She spawns the Jellyrashes in the final 2 sections of the battle (outside of the fortress walls and on the Snowfield); in particular, when she is at low health, she will spawn 30+ at a time in the last section, so you gonna have to hold back if you want to complete the mission; in the same vein, if you want to avoid the dcs (until a proper fix appears) you are gonna have to stay away from her during the first section (the four rooftops), so you just gotta be patient and dodge her attacks.
