03/21/2014 01:22 EDT | Updated 05/20/2014 05:59 EDT

Mother of slain northern Alberta woman files public complaint about RCMP

EDMONTON - The mother of a woman believed to have been slain south of Edmonton four years ago has filed a federal public complaint against members of the Leduc RCMP.

Vivian Tuccaro of Fort Chipewyan, Alta., says ever since her daughter vanished, her family has not had total cooperation from the Mounties.

Tuccaro alleges the RCMP "failed to perform an adequate investigation" into her daughter's case.

In September 2012, a group of horseback riders discovered a skull in a wooded area in a field on a rural property near Leduc.

Dental records determined the remains as belonging to Amber Tuccaro of Fort McMurray, Alta.

The 20-year-old was visiting the Edmonton area when she was last seen getting into an unknown man's vehicle on Aug. 18, 2010.

Her family reported her missing two days later.

In October 2011, police say developments led them to turn the case over to Project Kare, a police team that investigates missing or murdered women, but there have been no arrests in the case.