Police became suspicious when they saw a support worker speeding and stopped her.
Angela Bradley was then found to be over the alcohol limit.
Bradley, 52, of Breck Road, Poulton, pleaded guilty to driving with excess alcohol.
Pam Smith, prosecuting, said police saw Bradley at the wheel of a Range Rover driving at excess speed along Redcar Avenue, Thornton, on October 24 at 2.20am
A breath test showed 43 microgrammes of alcohol in her body – 35 is the limit.
Gerry Coyle, defending, said his client, who had no previous convictions, would lose her job as the result of the conviction.
Bradley was banned from the road for 14 months, fined £390 with £85 costs and ordered to pay a £150 court charge plus £39 victims’ surcharge by Blackpool magistrates.