Well at least she didn't say that she was proud of her ancestors, like Southern USA rednecks going into rapture about the Confederate Flag and Rebel Army or Navy ancestors who fought to maintain slavery.

The fact that she came up with deflections and evasions shows that she has some concerns about it. 

Why couldn't she just come out and reject her grandfather's actions, as most people in modern Germany and some people in modern Japan do?

We always learn from our parents and grandparents, but sometimes the way that we learn is by seeing what happens when they make bad decisions.