Yes she can save alot from the burning but, remember guys, the plot is changing, the butterfly effect is unpredictable especially when her memory is starting to return and her health is getting wors the higher age of OG fl memory she gets. I believe that the fire is only mentioned but the cause and how it happened wasnt, she cant investigate she doesnt have the authority to do so because she is only a princess in title, the king doesnt even pay attebtion to her, and people will just blame her if it really happen and accuse her if she warned earlier abt the fire. But i think she will find a way to stop the fire since she is literally saving everyone from the sacrifices not just the characters you just cant notice the little things she is literally doing.