The judge's remarks are interesting.
I don't agree with the statement that she intended to incite serious violence. She was upset, went for a walk, calmed down, and deleted it. She then tweeted later that violence is not the answer. I don't think that what she wrote is OK, and I think she did betray racist tendencies, but I still think that community service and a fine would have been more appropriate. Someone who intended to incite violence would surely have not deleted it and would have written more.
She's definitely racist, though. What he did was down to his flaws as an individual and nothing to do with his race or skin colour or country of origin or immigration status. It's incredibly stupid to extrapolate his terrible actions to a group as a whole instead of seeing that the responsibility lies with him alone. I'm sure she wouldn't like it if a British person committed a terrible crime abroad and the people in that country immediately hated all British people. She would see that as a really stupid conclusion to draw. So....