Oh no. I knew it was suspicious from the start, but when all the information about the family came out, I wondered if one of them were involved rather than the mother. I actually see it as an additional tragedy that a 22 year old woman was surrounded by dangerous criminals and had a violent marriage, with the pressure reaching the point where she would harm her own child. I'm also making the assumption that she was fairly insulated from the mainstream community if she didn't know that 10 am Saturday was the least likely point of the whole week for you to say that a drunken barefoot stranger had run off with your baby.
She could not have done this entirely alone though? Could she have said goodbye to her hosts on Saturday morning with a living baby in a pram, returned with an empty pram so the disappearance could be reported to the police, and then dumped the body afterwards? Where was the body for the 14 (?) hours between abduction and discovery? If it had been in the creek all that time, it would have been found sooner, and if she was in that area of the park for that long, she would have known it was too crowded and busy for a bizarre outdoor abduction.
There are still a lot of mysteries about this case.