Vampires On Planet V23

It's about a girl named Hannah Ark who is on summer vacation. Hannah goes to her uncles house whom she is really close with. Hannah's uncle is an astronaut and somehow Hannah ends up going to a new planet that has vampires, and she goes with her uncles roommate!! Then she finds out her "parents" aren't really her parents but foster parents. There are so many things that happen. You'll have to read to find out xD. This is a adventure/action/vampire type of story.