The protagonist, who thinks she was assigned a villainous role and who believes horrible fate will befall her if she doesn't mend her ways starts acting nice to the person who was bullied. This is more of a villainess story than like a third of the stories in this anthology. Besides, the story starts with Ella being bullied and ordered to clean the fireplace, is this not mean enough?
Is that bullying? If she's supposed to fill a servant role because of a commoner origin (which is the apparent backstory), cleaning is a perfectly ordinary task to expect her to do. The character being a prince in exile poses the question as to whether or not the mother knows, which I suppose we're to take she does because royalty wouldn't be entrusted to just anybody, even if apparently lacking in magic.
Regardless, the FMC believing she has been reincarnated as a villainess does not mean she actually has been, it can very easily (and probably is) comedic misunderstanding, and the fact that no villainy actually happens makes me believe it's simply not fulfilling the requirements for the series
That other stories in this series also don't actually have any villainy in them is no excuse, frankly it's just an argument that a lot of authors that have been a part of this work don't have any interest in telling stories that involve a villain or villainess, twist or not.