Andreea Cristea was knocked into the river after a car driven by Kent-born killer Khalid Masood ploughed into pedestrains across the central London bridge on March 22.
The 31-year-old had been fighting for her life but was believed to have been showing signs of improvement following the attack.
Andreea Cristea was knocked into the thames in the attack
Ambassador to Britain Dan Mihalache said she underwent surgery to remove a blood clot from her brain.
But Ms Cristea, an interior designer from the Black Sea port of Constanta, has now succumbed to her injuries.
Victims of the Westminster terror attack Fri, April 7, 2017
The Westminster attack has now killed six people
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Andreea Cristea died of her injuries following the Westminster terror attacks
In a moving statement, her family and partner Andrei Burnaz said: “After fighting for her life for over two weeks, our beloved and irreplaceable Andreea – wonderful daughter, sister, partner, dedicated friend and the most unique and life loving person you can imagine – was cruelly and brutally ripped away from our lives in the most heartless and spiritless way.
“She will always be remembered as our shining ray of light that will forever keep on shining in our hearts.
“There are no words to even begin to describe the crushing pain and emptiness that is left in our hearts.”
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Her partner Andrei Burnaz released a moving statement after her death
Andreea Cristea was on a short break to London
The Romanian tourist was on a short break to London with her boyfriend at the time of the shocking attack.
He had been due to propose later that day, but their happiness was shattered when Masood drove an SUV down the pavement of Westminster Bridge.
Footage from the scene showed the shocking moment Ms Cristea fell from the edge of the bridge into the river 17ft below, as people desperately rushed to rescue her from the water.
She was pulled out by firefighters who directed a boat towards her, but died in hospital on Thursday – two weeks after the attack.
There are no words to even begin to describe the crushing pain and emptiness that is left in our hearts
Family of Westminster terror attack victim Andreea Cristea
Her family have now decided to give the money, donated by generous well-wishers to aid her recovery, to charity following her tragic death.
A statement read: “Andreea is now unfortunately not able to have part of the money that was raised for her recovery, so we would like to donate it to charity. She would not have it any other way.
“Our family, together with Andrei, are deeply touched and eternally grateful for the unimaginable efforts and never-ending dedication provided to her and us by the entire medical personnel of each and every hospital involved.
“Their kindness and empathy are beyond compare.
Mr Burnaz suffered a knee injury but was discharged from hospital
The harrowing attack in Westminster lasted just 82 seconds
“Our hearts and love go out to our two Family Liaison Officers, Detective Sergeants Tony De-Wilde and Geraint Jones, who stood beside us every single step of the way.
“You were our lifeline and we will never be able to thank you enough."
Mr Burnaz, also from Romania, suffered a knee injury but has since been discharged from hospital.
Masood killed five people before he was shot dead following his 82 seconds rampage in the UK's capital city.
Victims included Kurt Cochran, a US tourist from Utah who was celebrating his wedding anniversary, Aysha Frade, a mum-of-two who was on her way to collect her children, and 75-year-old Leslie Rhodes who was described as "the nicest man you ever met".
Andreea Cristea's boyfriend was due to propose later that day
After crashing his car into railings, Masood then got out and stabbed PC Keith Palmer to death just yards from the Houses of Parliament.
A Met Police spokesman said: “Whilst formal identification awaits, we believe the woman to be Andreea Cristea.
“Andreea was a Romanian national, but had been visiting London.
“Next of kin have been informed and are being supported by specially trained family liaison officers.”