The chilling attack came just hours after the gang posted a vile video on social media - as they drove by the young woman's home, warning her: 'See if it's like that later, isn't it' - accompanied by laughing faces and nine fire emojis.
The woman has no involvement in crime and it is believed the gang have targeted her over a personal grudge.
The Flashy crew's sickening vendetta against the woman has also seen the thugs post pictures of her and her family online - offering a 'bounty' of €10k to anyone who slashes her, her family or burns down their properties.
CCTV obtained by the
Sunday World shows two thugs arriving at the home in Finglas on Dublin's northside on a bike at approximately 3am - before one man enters the garden armed with a petrol bomb.
As his accomplice stands guard at the garden wall, the arsonist attempted to smash the front window of the property so he could launch the incendiary into the front room.
But when the noise awoke a neighbour, the thug abandoned this plan and instead threw the petrol bomb at the front door of the property before fleeing.
As the pair made their getaway, the neighbour, who is understood to be a relative of the young woman, attempted to give chase.
But the thugs got off the bike, forcing him to retreat back inside his home.
Moments later, a woman emerges from the nearby property and runs to the young mum's front door, where she works to extinguish the flames.
The attack on the young mum's house comes at a time when Flashy's so-called 'Gucci-gang' are also waging a horrific online campaign of intimidation against a separate young woman linked to their murdered rival James 'Whela' Whelan.
In videos posted online by the Flashy mob, they can be heard taunting the young woman about Whelan's death and chillingly warning her, 'your [sic] next.'
Whelan was gunned down in the Deanstown area of Finglas on April 3.
His murder, after being lured to his death by the Flashy crew, has led to a major crackdown by gardaí on the gang's operations.
On Wednesday, officers from Pearse Street Garda Station raided a number of properties in the Pearse House complex.
The raids arose as a result of an investigation by the station's Serious Crime Unit into a gun attack by the gang on another innocent family's home on Mercer Street in the wake of Whelan's murder.
Gardaí believe the gang fired shots at this property in an attempt to intimidate an innocent relative of Whelan's.
Separately, gardaí also searched a number of properties in Portarlington, Co. Laois, which have also been linked to the gang.
In a statement concerning these raids, gardaí confirmed: "A number of items were seized during the searches. No arrests have been made at this time. Investigations are ongoing."
Flashy is understood to have remained in the Finglas area despite a heightened Garda presence, designed to keep a lid on feuding between his crew and local criminals who were loyal to James Whelan.
A local source this week told the
Sunday World that there is 'a growing repugnance in the area' for the activities of Flashy and his crew.
"His activities aren't just angering people who aren't involved in crime," the source said.
"There is increasingly an anti-Flashy sentiment among criminals who would not have been involved in this.
"That's bad news for him, but will probably only make him more paranoid and dangerous."
In the wake of Whelan's murder, a number of separate criminal factions joined forces in an attempt to oust Flashy from Finglas.
An alliance between the criminals was agreed at an impromptu crime summit that took place in the garden of a property in the Kippure area of Finglas in days after Whelan's funeral.
A source said the meeting involved senior players, now aged in their 40s and 50s, who have been involved in long-term feuding in Finglas for decades.
"The meeting in the garden showed who is aligned to who, and it is bad news for any chance of peace in this neighbourhood," a source said.
"Whelan's crowd - the 'Scooter' crew - now have the backing of lads that would have hung around with 'Marlo' Hyland."
Hyland was shot dead in December 2006, in a vicious murder that led to a huge round of feuding that resulted in up to 15 more killings during the blood-soaked reign of slain gang boss Eamon 'The Don' Dunne, who was himself gunned down in 2010.
The source continued: "So what you have aligning themselves with Whela's associates are lads that survived all that mess, all that murder.
"They are seasoned lads and you won't find them involved in social media warfare like the younger generation.
"And it is clear that they are against who the media call 'Mr Flashy'."