There are several ways to contact her:

Number One - write her letter

Harpo Productions
P. O. Box 909715
Chicago, IL 60607

Number Two - send her an email

Go to www.oprah.com - check the blue navigation bar "Inside Oprah.com" and click "Email us"

Good Luck with this one! I have emailed Oprah's staff several times and never received any reply. Therefore, it seems they are quite busy and it takes a while for them to respond, if they respond...