While Freya was busy huffing and puffing being tormented by Jasper, Esther was also going through a great change.
Esther was a spoiled child from a very young age and always gets what she wanted no matter what. When she was still young and foolish, she fell for Amy's scheme and began a battle that lasted years with Arianna.
She was also jealous of the other as every girl would hate any girl who was a bit better than herself. Arianna had it all, who didn't know how loved and spoiled Arianna was.
Just seeing Arianna made Esther very angry that she always picked on the other every chance she gets. The one thing that made her angrier was the fact that Arianna didn't even put her in her eyes.
How can she accept that? So, she did her best to fight Arianna and yet after years of fighting like kids, she got defeated. The schemes were finally revealed and knowing that she was used by someone really made Esther to open her eyes wide.