A woman who filed a lawsuit against Alberta Education after her son was locked in a seclusion room at school says she is "very disheartened" after a legal blow.

Inclusion Alberta and parents of children with autism say the Alberta government has not done enough to deal with seclusion rooms in schools.

A mother and father hope policies around seclusion rooms will change and they've launched a lawsuit against the Alberta government and a school district over the treatment of their son.