A Broken Hero's Tale

In a world ruled by darkness, a hero of light is born. She doesn't take too kindly to villains and likes to lay the smack-down on the followers of darkness that come to her home town. She even sent us this to know some more about her, I wouldn't want to be rude by not allowing you to read it, so here's a little bit from our hero!

"Hiya there! I'm so glad you decided to write a story about me! Anyways, I'd like to get the basics out of the way before the story starts. My name is Grimmissa Gale, I like to wear a set of white armor and carry a huge sword with me. My one goal in life is to slay the evil vampire queen that holds my homeland hostage and free the people I care about from darkness!"

As you can see, she is quite ambitious. I'm honestly just curios as to whether or not she has what it takes to stop her.
Also, vampires are a type of mid-class demon.