I agree, she just looks to be a large mixed breed. Black is a common color in many breeds, so color isn't really an indicator. She doesn't have any particularly distinguishable characteristics that would tell me otherwise.
Beverans, which I'm thinking is what you meant, are not a very common breed and would be unlikely to see in a pet home. Flemish are more common, but this rabbit doesn't look to have the right build or size to be Flemish.