She then pushed the victim in the chest, before closing the car door on her, forcing her on top of her child in the passenger seat.
As Thomas-Oliver walked away she screamed: “I will f***ing kill you.”
The aftermath was filmed on the victim’s phone, the court heard.
Thomas-Oliver told police she was “having a mental health episode”, had blacked out and was unable to remember most of the incident.
Court documents show the coffee attack was a continuation of wild behaviour from the previous month.
Between October 3 and 7, Thomas-Oliver bombarded her former partner with 193 messages, 25 phone calls and two “inflammatory” social media posts — all of which threatened the safety of the man and his new girlfriend.
“Leave her. Otherwise I’m getting gangs involved,” one message said.
“I 100% do not care if she is murdered and her kids have no mother, she deserves it,” said another.
Thomas-Oliver also made threats about her ex-partner’s beloved Ford Falcon.
And on October 12, she followed through.
The defendant went to his Mornington home and poured an unknown chemical over two vehicles parked outside, damaging the paintwork.
One of them was the Ford, which police said had “immense sentimental value” because it had belonged to the victim’s dead friend.
A bail application for Thomas-Oliver was postponed so a new report regarding her mental health could be completed.
Judge Kevin Phillips convicted her on three counts of threatening to kill, assault with intent to injure, assault and wilful damage.
He advised her to prepare for the worst when it came to sentencing in March.
“My indication to you Thomas-Oliver is a fulltime custodial outcome I think will be the result after hearing the facts,” the judge said.
A probation report would, however, consider the viability of an electronically monitored sentence.
