If it makes you feel better, there has been a case in the past that an art was disqualified/didn’t win because more than half of the vote were made by new account/IP, making it clear that the artists either made a bunch of new accounts/asked their friends to make a new account to vote for their art. So if serearu really spammed other servers and those people end up registering and voting for her art, it’s her disadvantage instead.
I can’t support either party especially since I’m not in the server so I can’t comment more, but the admins will definitely do something if rendered necessary, so you actually don’t need to stand against the artist as much as this. Let the admins decide depending on their policy.