Grant's boyfriend Mark (last name unknown) told the gossip website that they were traveling in a auto near a toll when another vehicle swerved in front of them. Mark ended up crashing into a barrier to avoid hitting them.
TMZ reports that Samantha, who has multiple sclerosis, "hit the windshield and fell to the floor mat", and was taken to the hospital where she's receiving treatment.
Meghan has reportedly never been close to her half-siblings, including Samantha and Thomas Jr.
"If it's about my life or my father's then there's something in this country known as freedom of speech", she started her rant in the above video.
The news of this accident follows a fresh update on Samantha and Meghan's father's health. Markle previously told the online tabloid that surgeons had to operate to clear a blockage and fix damage.
Thomas Markle will miss the royal wedding because of his health and will not walk Meghan down the aisle.
Meghan Markle wanted her estranged half-sister to remain quiet in the days leading up to her royal wedding Saturday at St. George's Chapel in Windsor Castle, but that's not going to happen.
Reports from TMZ claim Samantha sustained a fractured knee and broken ankle and was taken to hospital.
Meghan's father was also caught up in a photo scandal after it was revealed he posed for paparazzi pictures ahead of the wedding.
Grant added: "She doesn't have a relationship with anyone in the family".
"I have to say I am entirely the culprit", she said in an interview with ITV's Loose Women.
Photos emerged last week of Thomas making preparations for his daughter's big day.
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