So let's break down the war crimes. How forced was she to do it, the methods, the benefits, and the victims.
Ariqa:
-No one directly looking her shoulder, just a vague "pressure" from above.
-Straight up disregard for life and started with orbital bombardment
-Directly benefitted from it
+Victims were secessionists? (Succession worlds or secession worlds?)
Bantallian:
+Direct pressure from in system superiors
+Demonstration strikes instead of going straight for the kill'em'all. (Still killed most of them, bad)
+Life actually on the line from superior and commisar equivalent
-Victims were only striking
Kardean :
-"I followed orders" so little pressure
-Could have limited fatalities with disabling shots while following orders
-Benefitted from it
-Victims were literally unarmed and probably dying from enforced blockade anyway.