Vampire. Modern times. I read this between 3 and 5 years ago maybe. Spoiler.

[Aubrey]

Plot: This series follows the story of a girl who begins to experience
strange changes as she turns into a vampire Her brother shows symptoms that he may also
be turning at the end of the book. The book focuses on her adjustment
to her new life, the transformation process, and
a battle with a rival vampire faction. The series
ends with a cliffhanger, as her brother begins
to exhibit signs of turning as well. The siblings are teenage and she starts showing signs of being a vampire at a certain age. The vampire she meets is in a house across the street.