Also more important reasons why the FL runsaway mentioned in another person's thread on the link, this 2 comments covers it all
https://www.mangago.zone/home/mangatopic/12888017/
FL believes in the plot that ML will fall inlove to whoever cures the curse (which is the OG FL) But heres what I think, I think FL already cured him of the curse sometime.. (cause I seriously dont remember any other symptoms of the curse aside from the turning into a child in the day, then since that doesnt seem to happen anymore so..) if true there wont be anymore reason to runaway cause the fugitive problem can easily be fix if ML defeats whoever is behind it
Contrary to the comments I saw, I like the FL's priority first mentality. Not being swayed by emotions quickly and drop everything else just because of the handsome ML.. because it doesnt change her own status quo. Besides she'll figure it out soon, its just her mind is too focused on laying low, must not get caught up and safety first. Cause I dont know if people forgot but the sisters are still currently fugitives and lived in hiding for a long time now and are still are (the reason not yet revealed) in that very country and being close with the duke or any relation to the nobles (that works at/for the government) to fugitives is a bad thing in general + knowing the plot.. the duke & his place is the heart of danger so I get why shes anxious
Now about her being "annoying/stupid/frustrating".. FL left him because like most transmigrators she believed in the power of the plot + she believes that the duke still has the curse which was said that only the OG FL can cure. Thats why she thinks what she did and is doing right now is necessary, and that is to be out of the picture according to the original story cause she believes thats the only way for the OG FL can cure the duke besides the fact that she's a fugitive and all