My guess is that she gave him to someone so that her ex-husband would not get custody. Probably someone she met over the Internet who is in another country and came over here or had an agent do this for Trenton Duckett which would explain why no one has seen Trenton Duckett since.

I do not believe she killed herself over guilt over taking her son's life. She felt the walls closing in due to choices she made and the media painted a target on her back as a possible child killer. She just broke from the pressure and killed herself.