Unless we know the circumstances were the same - it really doesn't work to make comparisons.  Was she in a small, enclosed space where the public was soon expected to be?  Was she wearing multiple layers of thick clothing which would impact the effectiveness of the Taser?  Did she seem like a threat to the responding officer?

Unless there is some evidence that the officer's acted improperly - what does the family expect?  Clearly the man was a threat.  Should the officer have put on a chainmail suit and gone hand-to-hand with him?  If he had dropped the machete and sat down with his hands up - he would very likely still be here today.