The 30-year-old went there five days ago for the final part of Woods' therapy, which involves both of them, reported thesun.co.uk
Woods, 34, accused of bedding more than a dozen mistresses is expected to leave the clinic in Hattiesburg, Mississippi, with Nordegren this weekend.
Woods is said to be planning a second honeymoon with his Swedish wife aboard their $22 million yacht.
"Tiger wants to show her he is a changed man," said a source.
