Vicki Maria Cain has been charged after the alleged incident out the front of Tamworth Courthouse on Wednesday morning.

The 44-year-old allegedly approached a woman and made a verbal threat about 11.30am before the case was due to proceed in the court.

Officers witnessed the incident and allege Cain threatened to harm the woman to prevent her from attending the hearing, before she was arrested on the spot.

She was taken inside Tamworth Police Station and charged with one count of threatening a person with intent to influence a witness.

Police refused Cain bail, arguing there was an unacceptable risk if she was to be released back into the community.

During a brief bail hearing in Tamworth Local Court on Thursday afternoon, prosecutors argued the safety of victims, individuals and the community could not be mitigated by any conditions.

Sergeant Cynthia Donovan said it was a strong prosecution case with the incident witnessed by police.

Magistrate Michael Holmes told the court it was a serious offence, especially on the day of a hearing, and within the court precincts.

Mr Holmes said, if convicted, the offence carried a term of imprisonment with a maximum of 10 years.

He refused bail, with Cain to remain in custody.

A brief of evidence has been ordered and the case will return to court later this month.