& made such a row among the English. They should not have burnt her--but they did.

I was quite surprised at JA's comparatively positive account of Joan of Arc.
Nowadays, Joan of Arc is worshipped by the mass medias, there are countless movies, documentaries, books etc. and we get the impression of a great heroine (though there are some objectors of course).
So I naturally concluded from They should not have burnt her, that JA admired her courage and all that, too.
But the more I think about it the more I doubt this. JA would not have liked a French Catholic who claimed to have God's commission to dress like a man and lead the army, I suppose. So probably JA only meant that she was a common girl that was badly used and punished for nothing.