"She won't speak to how she physically got the baby or when or the identity of the birth mother," People magazine senior editor David Caplan said.
Meanwhile, it seems everyone wants to say they're sorry to the actress.
James, who has publicly apologized to Bullock and his three kids, recently returned home after a 30-day stay in a treatment facility where he sought help for "personal issues." He told People magazine that he regrets losing Bullock and Louis.
"The love I have for Louis cannot be put to words," James said. "Not having him around to love and to hold has left a huge hole in my heart.
"Sandy is the love of my life, but considering the pain and devastation I have caused her, it would be selfish to not let her go," he added. "Right now, it is time for me to beat this addiction that has taken two of the things I love the most in life."
Melissa Smith, one of the women who reportedly had an affair with James, faxed a letter of apology to Bullock Sunday, according to TMZ.com. Her apology followed that of Michelle "Bombshell" McGee, the first woman to claim she slept with James.
"I felt I needed to reach out to you and tell you how deeply sorry I am for everything that you've been through," Smith wrote. "I am sorry for any hurt or pain that I have caused you. My actions of engaging with a married man are unforgivable. I never meant you any harm."
Smith added, "I compromised my beliefs on several occasions and as a result will never forgive myself," before concluding, "Please contact me if you wish to discuss on the phone or in person."
Prior to Wednesday's divorce announcement, Bullock had only addressed the reports about James' reported cheating once. At the beginning of April, she broke her silence -- not to discuss her marriage but to deny rumors of the existence of a sex tape.