she isn't evil she want's only to be forever beautifull because she things that this is the only reason why people like her
i mean it was all the fault of Zirconia showing her herself in the future as a old ugly woman

She's misunderstood,that's usually the case with most villains the way she does certain things isn't the best but she wants to be beautiful forever and that's what causes others to draw their attention to her..because of what Zirconia showed her..and she started that after it was shown and I just feel Nehelenia is misunderstood.