The wife of controversial union leader John Setka was allegedly more than five times the blood-alcohol limit and driving at 126km/h with her two children in the car when stopped by police on Boxing Day.

High profile lawyer-turned-political staffer Emma Walters had been in a domestic dispute with Victorian Construction, Forestry, Maritime, Mining and Energy Union boss Setka earlier in the day before police pulled her over on the Western Highway.

Emma Walters failed to turn up for her drink driving hearing at Horsham Magistrates Court. Credit:AAP

The couple's children, aged five and seven, were in the car when highway officers stopped her in a 100km/h zone near Horsham, more than 300 kilometres north-west of Melbourne.

Ms Walters registered a blood-alcohol reading of .282.