Yasmin Ercan was today shielded from cameras, but just a few weeks ago she was accused of taking a social media fight to the frightening heights of a violent carjacking.

After being called a "dog" on Instagram, police allege the 19-year-old responded with a tirade of text messages telling her 18-year-old foe she would stab her in the throat and put a bullet in her head along with other terrorising threats to, “smash the f—k” out of her and “smash her f—ken teeth in”.

Ms Ercan allegedly sent threatening messages to her 18-year-old foe. (9NEWS)

The former schoolmates agreed to meet at the Braybrook shopping centre, in the city’s west, on August 13 at 7.30pm.

The court heard Ms Ercan and an unknown male got into the 18-year-old’s car; the alleged female attacker sat behind the driver's seat, while her co-accused aimed a Taser at her and told the teen to drive.

Police allege the young woman was forced to drive around for 20 mins.

Once outside the vehicle, Ms Ercan is accused of slapping, spitting on and Tasering the victim.

Magistrate Charlie Rozencwajg said the 19-year-old girl, who sat sheepishly in the dock, had a concerning side.

"Behaving like a stand-over merchant, walking like one, talking the talk,” he said.

While facing six serious charges including aggravated carjacking with a weapon, the Magistrate said it was likely Ms Ercan could ultimately be subject to just a kidnapping charge.

The alleged carjacking unfolded at a Braybrook shopping centre in Melbourne's west. (9NEWS)

Her lawyer was confident she would only receive a community corrections order if found guilty.

After being behind bars for two weeks, Ms Ercan was granted bail, her parents putting up a $50,000 surety and told they'll have to enforce her strict bail conditions that ban her from using a mobile phone or social media.