According to Samantha's boyfriend "Mark", the pair were driving when their vehicle was run in to a concrete barrier as they tried to avoid a collision with a photographer.
After Meghan wore a £56,000 designer dress for her engagement photo, Samantha said: "If you can spend $75,000 on a dress, you can spend $75,000 on your dad".
TMZ has reported, Samantha is recovering in hospital after suffering what appears to be a broken ankle and a fractured knee.
Samantha allegedly hit the windshield and fell to the floor mat, twisting her foot backward.
Meghan Markle's half-sister Samantha is furious that her estranged sibling is trying to get her to keep quiet and stay out of the media, so what does she do?
The news of this accident follows a fresh update on Samantha and Meghan's father's health.
Doria, who was on Tuesday pictured heading to the airport to make her way to the United Kingdom for her daughter's big day, is now tipped to give Meghan away after Thomas said he had to miss the wedding on Saturday and undergo a heart operation. He also claimed that he suffered a heart attack days earlier, even though paparazzi who had been following him claim he never went to a hospital and instead was photographed going to several greasy fast food joints. Markle previously told the online tabloid that surgeons had to operate to clear a blockage and fix damage.
Despite the chaos, Grant said she purchased a wedding present for Prince Harry and Markle. We can assume that she's speaking about her soon-to-be royal half-sister here.