The escalator to heaven (A half-angel novel)

This is the story of Valeriya Gregorovich. Life does not exactly work out well for her when she realizes that shes a half-angel with powers to control elements. On top of everything she has school and a very pesky sister to deal with. What does she do? She finds her father, the root of her lifes problem, except her father is a man very commonly known as the Satan.