Margaret Rooney was said to have shouted and swore at the woman, who was 29 weeks pregnant at the time and can’t be named for legal reasons.

Rooney was accused of threatening the foetus with violence and throwing a brick and she faced a separate charge of driving a car which had no MOT.

The 32-year-old denied committing the offences in her then hometown of Linwood.

Prosecutors claimed she threatened the woman and broke driving laws in the town’s Pentland Avenue on September 25 last year. She was due to go on trial over the claims in April this year at Paisley Sheriff Court but the case had to be postponed when an essential witness did not turn up.

The case was rescheduled for this week but did not go ahead after Crown Office prosecutors dropped the case.

Rooney, herself a mother-of-six, had pleaded not guilty to behaving in a threatening or abusive manner by shouting and swearing at the woman and threatening her baby.

She also denied breaking Section 47(1) of the Road Traffic Act 1988 by driving a Honda Civic Vision five-door hatchback which had no MOT.

And she now no longer has to answer the claims after the case was abandoned on the eve of the trial.

A Crown Office spokesman said: “It is the duty of the Crown to keep cases under review.

“After full and careful consideration of the facts and circumstances of the case, including the available admissible evidence, the Procurator Fiscal decided that there should be no further proceedings taken at this time.

“The Crown reserves the right to proceed in the future should further evidence become available.”