Her boyfriend, Mark, told the gossip site that the pair were driving near a toll booth when a paparazzi photographer confronted them, trying to get a clear photo.
Samantha went on, claiming Meghan's "not qualified to suggest" she keep quiet "under any law in this country". Mark ended up crashing into a barrier to avoid hitting them.
Meghan's half-sister, Samantha Markle has reportedly suffered a broken ankle after a run-in with paparazzi in the USA, according to her boyfriend.
Her boyfriend says that collision caused her to hit the windshield which led to her eventually ending up on the floor of the auto.
Suffering from MS, he said Ms Grant was unable to lift herself up and that her foot was twisted backward. Thomas' heart was seriously compromised after a heart attack eight days ago. Markle previously told the online tabloid that surgeons had to operate to clear a blockage and fix damage.
Earlier this week Samantha appeared on ITV show Loose Women and claimed she was behind Thomas Markle's decision to stage photos of himself ahead of the royal wedding.
The news comes after reports that Meghan's father, Thomas Markle, 73, will not be attending her and Prince Harry's wedding on Saturday in the United Kingdom due to health issues. Like our Facebook page Now To Love Royals for the latest news on your favourite royal family members!
Grant added: "She doesn't have a relationship with anyone in the family".
It comes just a day after Piers Morgan slammed the American, calling her a "little vulture" for constantly speaking about the royal wedding and trashing Meghan.