Lewes, whose real name was Susan Dillingham, died from lung cancer in 2002 at age 49. E.A. was just 19 at the time.
In 2019, E.A. went on another six-month road trip from Los Angeles to Palatka, Fla., where Lewes once lived, via Interstate 10.
She set out on the journey to learn more about her mom and wrote the upcoming memoir about her experiences along the way.
E.A. told People she suspected that Lewes lived with undiagnosed bipolar disorder with episodes of extreme paranoia and delusion.
Lewes met the “Cast Away” actor, 68, in the mid-’70s while they were both studying theater in Sacramento.