A human resources worker used fake text software to relentlessly troll her boss for six weeks until the woman quit.

Emma Norman, 28, used SMS spoofing software to send her boss at South Western Sydney Primary Health Network seven texts a day that appeared to be from other colleagues.

The bullying messages led the boss to quit in April 2017 and got a colleague she impersonated wrongfully sacked for misconduct, leaving her with depression.

Emma Norman (pictured), 28, used SMS spoofing software to send her boss at South Western Sydney Primary Health Network seven texts a day that appeared to be from other colleagues

Norman is accused of sending 300 texts to her boss in three months, leading her to fear for her own safety and the safety of her children. Pictured: A mock-up of one of her alleged texts

Norman pleaded guilty to stalking and intimidating last month at Parramatta Local Court and will be sentenced in March.

But since then she has been arrested again over a separate case involving a more recent job at a workers' compensation consultancy, reported the Daily Telegraph.

What is SMS spoofing? SMS spoofing software, available online, allows users to send a text and choose a number that the text appears to be from when it arrives Advertisement

Norman has been charged with using a carriage service to menace/harass/offend and using a carriage service to threaten serious harm.

She is accused of sending 300 texts to her boss in three months, leading her to fear for her own safety and the safety of her children.

One text allegedly said: 'Maybe I should come to your house and stab your kid. Which kid do you like the least?'

She also allegedly sent a text to a client that appeared to come from her boss, saying: 'Since the moment I met you, all I can think about is putting your d**k in my mouth … want to hook up sometime? This will benefit you (and your company).'

Norman, who was sacked from her most recent job in December, allegedly sent a text to clients saying: 'Please be advised you may need testing if you have been treated at (a physio used by the company) in the past 12 months as a physio has tested HIV positive.'

After she was sacked, she allegedly sent a text to her boss saying: 'My New Year's resolution is to make your life hell and destroy your company.'

It is alleged she continued to troll the company by sending a text in January to clients saying: 'It is with sadness that I advise you (our company) will shut its doors on 1 February.

'Moving forward you can contact Recover (a rival firm) on 1300 550 276 for your workplace rehab needs.'

She also allegedly impersonated a colleague and texted the boss threatening to cyber bully and 'fat shame' her 13-year-old daughter.

Norman, who lives with her mother, is currently on bail and banned from contacting her old boss and four other complainants.