Rabbits breeds don't really matter. Rabbits have been bred only for their fur for centuries so there is little difference between them character and care wise - they are all pretty close to their wild cousins. Your rabbit doesn't look like a Havana, who are big rabbits (over 3 kilos) with long ears. Like ladysown said, if she doesn't come from a real breeder (one who does only a few breeds and who showed you the parents) chances are she is a mutt - with the plush coat she has, she could be a lionhead mix or have an angora in her ancestors. She's very cute, it's all that matters ^^