Witnesses called police and followed a woman to a supermarket car park after seeing her 4x4 hit a car in the street and drive off.
The driver, Denise Clayton, blew 92 microgrammes of alcohol in a roadside breath test – more than two-and-a-half times the legal limit.
But she “just got so nervous” and failed to supply an evidential specimen of breath at the police station despite seven or eight attempts, Spalding magistrates heard.
Clayton (62), of Sutton Road, Sutton St James, was banned from driving for 12 months, fined £180 and ordered to pay £85 costs with a £20 victim surcharge when she pleaded guilty to failing to provide a specimen for analysis.
She can cut three months off the ban by completing a rehabilitation course.
Prosecutor Marie Stace withdrew a charge of failing to stop after a road accident as Clayton told police she was “unaware of having been involved in a collision” as that was a statutory defence.
Miss Stace said a witness was driving towards the memorial in Market Place, Long Sutton, at about 4.20pm on October 1 when she saw Clayton’s green Isuzu Trooper reversing out of a parking space.
The witness stopped to allow Clayton to continue, only to see her vehicle reverse quite quickly into a parked vehicle and then drive off.
Miss Stace said the witness called police and then, with another witness, followed Clayton to the Co-op car park.
Solicitor Mike Alexander, mitigating, said Clayton had something to drink that day and it was quite clear that “she perhaps would have been over the limit”.
He said Clayton tried seven or eight time to provide a specimen of breath but was too nervous to complete the test.
Mr Alexander said Clayton told police “just take my blood”, but police don’t have to do that and the offence of failing to supply was made out.
He said: “She tells me ‘I simply just couldn’t hold the tube properly, I just couldn’t do it, I just got so nervous.’
“Mrs Clayton just says to apologise to the court for what has happened. She has never been in trouble in her entire life.”
He said Clayton was suffering major health problems because of a brain bleed, had undergone a number of tests including a CT scan and she was now on a long list of daily medication.
Mr Alexander said she had lost a lot of weight over the last year and now weighs just under six stones.