Similarly, alcohol is a diuretic that draws water out of the body, causing dehydration, and can compound the effects of elevated blood sugar.
Fayed pointed out that infections, like the abscess in Schuler's mouth that the family described earlier in the week, can also elevate the blood sugar and precipitate a crisis situation.
"There is no way that having a stroke or the diabetes prompted her to drink. There is no medical explanation that would explain that assertion," said Dr. Aman Patel, director of the Neurosurgery Residency Program at Mount Sinai Medical Center.
And Schuler's prolonged erratic driving suggested that she was not affected by a stroke. During the four hours she was on the road, driving home from the family's vacation campsite with her two children and three nieces, Barbara said Schuler crossed the median on the Taconic State Parkway three times and state police received a number of calls reporting her.
"A stroke ... except in extraordinarily rare situations, would not cause a person to drive erratically for long distances," Good said. "The attorney's argument has no validity, in my opinion."
"Do you think we'd be doing this if we thought she was an alcoholic?" Barbara asked today.
As the family searches for answers, Jay Schuler said that Shuler's 5-year-old son Bryan is "doing well."
"He is going to be OK, but it's going to take a little time."
She also sent a message from the Schulers to the family of the other victims of the crash.
"They are in our prayers," she said.
ABC News' Dan Childs contributed to this report.