Tracey Matters says she is not satisfied with a review into how B.C's police watchdog handled the case because it is not re-examining the facts in her brother's death.
She says she is also concerned about conflict of interest because retired officers work in the Independent Investigations Office.
Last week, the agency appointed a third party to review its investigation because it first reported Matters was shot in the chest, while a pathologist later told a coroner's inquest the soldier was shot in the back.
Agency spokesman Richard Rosenthal says Vancouver lawyer Mark Jette's review will not reopen the investigation into Matters' death but will focus only on the agency's actions.
The watchdog cleared officers of criminal wrongdoing in a supplemental report released this month, where it blamed unclear language for the difference between its report and the pathologist's testimony.
Matters was being treated for post-traumatic stress disorder when he was shot by officers in September 2012.
Police were attempting to arrest him on a charge of attacking his brother.
Officers said they had no choice but to shoot Matters because he was brandishing a hatchet and approaching an officer who had fallen and could not defend himself.