@faladante try to go further back, select load and go back 5-7min, that should be enough to get you to the start of the fight, you should have the saves as the game does it automatically, it worked for me the 2nd time after killing her so it might work for you as well

After killing Fulke, you have to defeat the other saxons but nothing happens, the title quest is still on the left side but nothing underneath of what to do or where to go, I had to reload and fight Fulke again to fight the saxons and end the quest.
After passing this quest I got one frozen screen and 3-4 game crashes, I’m not even doing anything related to the main quests, just collecting wealth and gear‍️