10/05/2011 at 08:15 PM EDT
Although released from an Italian prison and back home with her family, Amanda Knox's ordeal is far from over, her father says.
The 24-year-old American woman may return to the University of Washington, where she was a student at the time she arrested for the brutal murder of her roommate in 2007, but that remains uncertain as she enters an uncertain future, Curt Knox tells the Associated Press.
"What's the trauma ... and when will it show up, if it even shows up?" he said Tuesday outside his West Seattle home. "She's a very strong girl, but it's been a tough time for her."
Amanda, 24, returned to Seattle
on Tuesday night after an appeals court overturned her 2009 conviction
of murdering 21-year-old Meredith Kercher in Perugia, Italy, while they were exchange students.
For much more on Amanda Knox's ordeal, including exclusive interviews with her family and a jailhouse letter she wrote them, pick up this week's issue of PEOPLE