Carmen Mazo, 43, said her lucrative career was destroyed after she stumbled over the low-lying rope which marked out the pub’s beer garden.
The HR consultant says the injury left her with scars she fears will make people think she self-harms.
She also said the injury was responsible for “roller-coaster” mood swings.
The incident in August 2009 happened outside one of west London’s best-known gastropubs – The Westbourne in Notting Hill, run by artist Sebastian Boyle.
Ms Mazo was initially off work for several months.
She returned, only to give up for good three years later.
She previously sued the pub’s operators in 2013.
After they admitted liability she was awarded £156,871 at Central London County Court.
The award was more than the initial payout offered to Britain’s most injured soldier Ben Parkinson who was maimed in Afghanistan.
Then aged 23, the paratrooper was blown up by a landmine in 2006.
He was left in a coma for months with 37 injuries, including losing both legs, damage to his spine, skull, pelvis, hands, spleen and ribcage.
Initially the Lance Bombardier was offered just £152,000 along with a £19,000-a-year pension.
However, after a battle by his mother Diane and public outrage, the hero was then awarded £570,000.
A judge had rejected Ms Mazo’s new claim to more than £4.2m after finding her injury was not bad enough to justify her giving up her work.
However, she has now been granted permission to take the multi-million pound claim further.
In a statement, Ms Mazo said the accident and subsequent arthritic condition had robbed her of everything she had built up during her working life.
She said she would have expected to be earning £700 a day by now, but will have to go back to the “bottom of the ladder” and retrain in another career.
The accident had also had a devastating impact on her mental health and social life, she claimed.
“I’ve been left with what I consider horrendous scars on my wrist, which I am extremely conscious of,” she said.
“To an unsympathetic observer this might look like I am prone to self harm. This is very distressing for me.
“My career has always been my refuge to block away unpleasant circumstances in my personal life.
“But now, because of a bartender’s irresponsibility, I could end up with no career or purpose in life.”
She continued: “My mood changes are like a roller-coaster, changing from anger to sadness in seconds.
“I am easily irritated and lose my temper very easily, then end up breaking into tears when I realise I was never like that before.
“The accident has totally destroyed my work and social life. I do not think that I will ever be my old self again.”
Judge Heather Baucher initially rejected Ms Mazo’s new claim.
However, granting permission to take the “loss of career” point to the Appeal Court, Lord Justice Laws said: “It seems to me she is entitled to have the matter examined in this court.”