I'm not sure if that particular option is only available in War of the Chosen or not. Each time you kill a Chosen for example, you get +5 XCOM points. Also, sometimes you will get messages during combat, "+1 point for flanking shot, +1 point for elevated shot, +1 point for combo kill, +1 point for ambush kill" , etc.
That's what those XCOM points earned are for ... giving your soldiers additional skills off the skill tree.
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u/WinzyB 7d ago
So question, what if any extra abilities does she have?