I don't know. Some things are definitely red flags. Refual of kate to answer any questions in the interview. The fact as admitted by kate and Gerry in their interviews, that she often woke up during the night. They even had a reward chart for her at home, where she got stars for not getting up at night.
Now if your holiday plan is for your kids to sleep while you go out drinking, and you have a child that often wakes up, and was heard crying for an hour a couple of nights earlier asking for Mummy and Daddy, until the mccanns returned after 10pm. Considering that as doctors they had access to sedatives, then its possible they could have sedated her.
When kate found her missing. She was heard shouting "We let her down", when asked about this in her interview she refused to answer what she ment when she said it. Again, its a strange thing to shout.
The time lines are a bit strange too. Jane Tanner saw the man carrying a girl at 9:15, however someone was checking on the kids in the McCanns appartment at 9:05. He claims he listened at the kids bedroom which was ajar and didn't hear anything so assumed all was well. Thats a lucky child abductor because he must have been in the apartment at that time.
Saying that, there is evidence to say she was abducted, someone had gotten into the bedroom window of the apartment above the mccanns a week earlier and was chased off. There are reports of a man looking through the mccanns window from people not associated with the mccanns.
So i don't know, but its an interesting case for sure. I just hope we find out either way.