The mother and sister of Shanquella Robinson, the 25-year-old woman who died while vacationing in Mexico last month, told ABC News' "Good Morning America" in an exclusive interview that they knew she didn't die of alcohol poisoning. Her death is being investigated as a femicide, a form of gender-based violence, according to the State Attorney General's Office of Baja California Sur. Robinson, of Charlotte, North Carolina, went to the resort city of San Jose del Cabo on the southern tip of Mexico's Baja California peninsula with six friends on Oct. 28. Robinson's mother, Sallamondra, said she spoke with her daughter on a Friday night before she was getting ready for dinner, not knowing it would be their last conversation. "She said, well, mother, I'm getting ready to eat," Sallamondra Robinson told "GMA" in an interview airing Friday. "I said, well OK. Enjoy yourself. Have a good time. And I love you and I will talk to you tomorrow." The mother said she got a frantic telephone call from her daughter's friends the next day, saying she had died from alcohol poisoning. "Saturday evening, I got a call saying that Shanquella wasn't feeling well," Sallamondra Robinson said. MORE: American woman's death in Mexico investigated as femicide However, the Mexican Secretariat of Health's autopsy report and death certificate for Shanquella Robinson, obtained by ABC News, lists her cause of death as "severe spinal cord injury and atlas luxation," with no mention of alcohol. The document also states that the approximate time between injury and death was 15 minutes, while a box asking whether the death was "accidental or violent" was ticked "yes." #shanquellarobinson #brooklynteatalk #reactionvideo Join this channel to get access to perks: https://www.youtube.com/channel/UCG261e_-_MmsxulLsGeakdQ/join ... https://www.youtube.com/watch?v=Sfj0kRVLhKY