Super Starrella. Secret Supers, #1

Teen superhero, Starrella, and her flying horse combat vicious killers in the skies of Atalanta. The quiet summer before her freshman year turns frighteningly weird after Estelle Wright trespasses onto an Army base. Blown into the air and knocked unconscious, she wakes with a nascent superpower. Not to mention a winged horse with a snarky attitude and a mind of her own. Back home in Atalanta, a serial killer is targeting the students at Goldman University.
Before long she must juggle college classes with sneaking out of the house after dark to battle alien monsters. Estelle's life is in danger, but who can she trust: handsome Mark Copper from military intelligence, or hunky Toby, the tough gangster with a motorbike? Both men have secret agendas, but falling in love is not in their plans. Young adult superheroes, quirky animal sidekicks, and a dash of romance enliven this thrilling adventure.
Book 1 of the Secret Supers.