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Dad: Amanda Knox 'Running on Adrenalin' in Seattle

Oct. 4, 2011: Amanda Knox tries to gain her composure to make a statement to the media as her father, Curt Knox, stands behind, shortly after her arrival at Seattle-Tacoma International Airport in Seattle. Knox was freed on October 3 after an Italian appeals court acquitted her on murder charges after four years in prison. Curt Knox says Amanda would like to go back to her university and finish her degree, but that he worries about what the time in prison has done to his 24-year-old daughter.

Oct. 4, 2011: Amanda Knox tries to gain her composure to make a statement to the media as her father, Curt Knox, stands behind, shortly after her arrival at Seattle-Tacoma International Airport in Seattle. Knox was freed on October 3 after an Italian appeals court acquitted her on murder charges after four years in prison. Curt Knox says Amanda would like to go back to her university and finish her degree, but that he worries about what the time in prison has done to his 24-year-old daughter.  (AP2011)

SEATTLE -- Curt Knox says his daughter Amanda hasn't slept much since arriving back in Seattle on Tuesday after four years in an Italian prison.

He told KOMO Radio "she's literally running on adrenalin" as she reconnects with family and friends. He says it will take some time before the family figures out what the "new normal" will be.

The 24-year-old former University of Washington student and her family left Italy immediately after an appeals court threw out her conviction in the slaying of her British roommate Meredith Kercher in Perugia, where both were studying abroad.

Earlier Thursday, Curt Knox told "Good Morning America" that Amanda occasionally slips back into speaking Italian. One of the things he says she has done since returning home is to lie down in grass.