Julia Howard, 49, of Mendips Road, Fareham, was caught on December 5 in Gosport Road in the same town.
She had been driving a black Mazda.
A test revealed she had 68 microgrammes of alcohol in 100 millilitres of breath. The limit is 35.
Portsmouth magistrates imposed a £30 victim surcharge and £85 costs with an 18-month driving ban.
She was offered a course that if completed would knock 18 weeks off her ban.
Hundreds of drivers were stopped last month in a crackdown.