This case reminds me a bit of the Oakland, CA shooting a few years ago when a police officer mistakenly pulled his gun instead of his tazer and killed a guy. There was just no need to cap the guy here, IMO.
Similar but the “errors”, if I may use such an understated term, were quite different.
The Oakland case showed us that the handle and general feel of the Taser was too similar to the service revolver. The officer in that case said he thought he had his Taser in his hand. If that’s the case, then IMO that might be more of an issue of a design flaw of the Taser than of the officer’s action.
If I am reading the details of this shooting correctly, it looks like the officer panicked, shooting reflexively when she heard, well, something.