I'm inclined to let this one slide because she is German and is a makeup artist who is probably trying to learn and experiment with her skill. Is it problematic? Yes. But come on, bounds of reason: we all know she didn't mean anything negative with it.
But the other bounds of reason, some people are sensitive to race issues for good reasons. I don't think she's actually racist, but I don't think people are being unreasonably offended. (Its the internet so I'm sure there are plenty of over-corrected responses full of bile, but the conceit that people shouldn't be generally offended by this, I disagree with)