Don't be ridiculous.  The employee will be disciplined seriously, probably even fired, and countless public servants will be forced into Indigenous Awareness sessions even if they never interact with them.  It will be administrative overkill on an epic level to signal remorse, yet even so will do nothing to placate wounded feelings.

No public servant goes on reserve looking to pick a fight.  She was trying to be helpful but obviously became frustrated with Ms. Big Head's opposition to whatever it was she was saying (and how it was opposed).  No matter how antagonistic Ms. Big Head may have been, this does not excuse the employee's frustration and reaction with a gratuitous racial slur.   The employee should, can and will be held accountable for her exceptional blunder.  

But nor does this excuse the opportunistic and hyperbolic allegations of government enforcing "genocide".