YA or Teen book possible about vampires; beginning of it was about a young girl who was holed up in a big house during winter time (she might have been sick?) and someone came to her in the night. It was a man

[Cheyenne]

The cover of the book was brown. The beginning of it was about a young girl who was holed up in a big house during winter time (she might have been sick?) and someone came to her in the night. It was a man and he was standing outside her window in the cold. I think the book might've been about vampires but I had to return it to the library before I could read more. I think one of the main character's name started with a D. Read the book around 2007-2009. Think maybe the book came from 2002.