She might be a Californian, or she might be a mix.
A mix of Californian with New Zealand White will give rabbits that have the dark nose/ears/feet/tail, but not as dark as a pure Californian. Since those points are light on bunnies anyway, and darken with age, I really can't tell for sure which one you have (pure Californian or mix.)
If you want to raise rabbits for meat, both breeds are good and so are the mixes, so it's not a big deal either way (but do watch out if you buy from that person again, because that is definitely not a pure New Zealand White.)
If you are trying to raise show rabbits, or purebred rabbits for any other reason, then of course it is important to know what breed you have, and being sold the wrong breed is a real problem.