The Amulets

Harper is a not a normal teenage girl. She happens to be a superhero, with small powers, two sidekicks, and one adventure. In Harper's world, there are four realms, each holding an amulet that controls an element:
The Flame Ruby
The Aqua Sapphire
The Weather Amethyst
The Earth Emerald
Each of these gems control an element, and they all present a challenge to gain each of them. Harper needs to get these amulets before all of the realms are destroyed. Can she take the challenge on, with a romantic situation also involved?