In her veterinary work, she identified reproductive and immunological problems among cattle to air pollutants, like sulphur dioxide, from the sour gas industry in the region. Her successful campaign to reduce that air pollution marked the beginning of her work as an environmentalist. They had two children by birth, and adopted two sons.
He pled guilty "to counselling to commit an offence" for offering a hit man $40,000.
In subsequent years she contributed her efforts to various environmental campaigns. These included blocking a hotel and golf course resort.
In 1998 she charged a sand and gravel trucking business for violating the federal Fisheries Acting. She campaigned to stop the building of the Oldman River Dam and followed with a legal campaign resulting in environmental improvements to the project when the Dam was approved and a Supreme Court decision that environmental protection is in the jurisdiction of both the federal and provincial governments.
In her work on the Clean Air Strategic Alliance committee, she was part of the effort that resulted in the reductions to air pollution.
In the fall of 2007, Kostuch announced that she had been diagnosed as terminal with multiple system atrophy. She declared her intention to choose when she would die, rather than letting the disease decide for her — supporting the right to die cause.