She was so envious of Swan, who was married to Gale, to the point she resented her mother for not forcing her to marry the Beast King instead.
'If only this stupid bitch arranges me to marry Gale instead of Swan. I would've become Queen Aria of the Beastmen Kingdom. I could've been loved by a strong, handsome, and vigorous man who would breed me every day. I would've gotten the treatment I deserve as Gale's wife, and I would've been the mother of his cubs!'
Deep down, Aria knew that it wasn't her mother's fault.
Anastasia was just trying to protect Aria because all of them thought that the Beast King would kill Swan after one night.
Aria just wanted to vent the hatred in her heart. She wanted to direct her hate on anyone, Swan, Gale, even her mother, Anastasia, for failing to make her the Queen of the Beastmen.
Swan had purified her power, but that didn't mean she was out of options. She still remembered what Madam Harsetti said.