It is funny/curious that on the one hand A is supposed to have hated VM and been angry that the latter usurped her place in Darmstadt/Ernie's affections; but on the other is said to have been angry at the eventual divorce!
Indeed!

I don't think Alix 'hated' Victoria Melita. I agree with Eric that Alix and Victoria Melita were too different in temperament to become pals. And Alix did notice at a very early stage that her brother wasn't truly happy with Victoria Melita and that Victoria Melita's absences from Darmstadt didn't benefit their marriage. On the other hand, Alix didn't put all blame on VM; she also advised EL on how to improve the situation. Perhaps her advice wasn't of much use, but it does show Alix had a more balanced view on the situation than to blindly blame and hate Victoria Melita for the failure of her brother's marriage.
Ernst Ludwig was perhaps biased, but in his letter of 10 November 1901 to his sister Victoria he stated that he had led a still more solitary life than Victoria Melita: "I was alone, she had her family, and I was only with one of you [his sisters], when she wanted it." To me this suggests that Victoria Melita didn't really appreciate visits from Ernst Ludwig's sisters to Darmstadt - or gave the impression that she didn't appreciate them - and that this applied to Alix as well as his other sisters. Frictions were perhaps most apparent between Victoria Melita and Alix. In
Erinnertes, his memoirs, Ernst Ludwig wrote that Victoria Melita didn't understand Alix and was jealous of her, but that his second wife made Alix feel welcome again.