how do I move on?

Ok so where to begin,
It all started in about April of 2012. I had heard that This girl at work was desperate for a baby but having a lot of trouble falling pregnant. (not being mean but probably weight related). She heard that i was a tarot reader (hobby) and had done successful and correctly accurate readings for other friends. She asked me for a reading one night when i was on late shift. I did the reading for her. She asked if she would be pregnant soon and have a baby. The answer was not only a very clear "NO!" But it looked as thou she was having some considerable marriage issues. It looked like her husband was about to leave.

About two maybe one and a half weeks later the woman ( who at this stage sits opposite me and diagonal to my friend says to us " Im 4 weeks pregnant!" Well my friend and i just look and each other in disbelief. Over the next few months she tells others she was pregnant but never a date or amount of time that was consistent or that made sense to the progression of the pregnancy.
She was never ever sick once. She was totally asystymatic. I know that is possible but she complained like she was unaware - didn't know what being pregnant was like - over compensating. She was guessing. Then her shape changed but inconsistently. Sometimes she was taught and round on her stomach and sometimes looser and kinda just fat. And this would fluctuate day to day until she realised I had noticed. This shape changing showed up at the same time as her "scan". The scan said it had been done at Black town Medical centre. Ive been to This medical centre for back related Scans - they don't do ultrasound. The scan she showed us at work was A3 in size and printed on xray film. I thought most machines these days printed onto thermal paper A4 in size?? Blacktown Medical send their patients down the road to another clinic with a different name. i believed she bought the scan and a fake belly from a website. She said she had the scan on a monday but didn't get the scan until the following friday. This is extremely unusual if not unheard of because they print them from the ultrasound machine.

I told a few people what i thought and most rejected my views. But i know what i saw, what she said didn't add up. The whole thing didn't add up. Everyone was fooled and they told me to let it go. I held fast to my views but stopped voicing them.
Months pass and the time of the "arrival" is here... The woman posts on FB that she had given birth On whatever date it was.... So I called the hospital to see if i could go see her. They told me they have no memory of her and no record of her ever being there.
I was talking to a friend of mine who was BFF's with this woman when she was "pregnant" and she told me that her husbands sister was pregnant at the exact same time as she was and she did not want to keep the baby. My friend and I believe she convinced her sister in law to have the baby for her and let her raise it as her own. So she is raising her nephew as her own son and telling everyone it was hers.

I hate that she fooled and lied to everyone. I hate that they all thought i was odd for thinking she was faking it and turned out to be right. I hate that this kind of person is a parent. But how do i let go now and not care if people know she faked it or not?

You need to distance yourself from this woman. Even though you were right all along there is nothing to be gained by proving this to your coworkers. You don't have to pretend to believe her, just be indifferent.

One line I always have used when someone was dishonest was, "that is incredible". Meaning literally, not credible.

I can see how this would be very frustrating on your part. You were made to look like the one that was crazy and maybe 'to interested' in her life. I am like you in the fact I can let things that really have no real impact or relivance on my life way on my mind. The best thing to do is just let it go. Dont talk about it, try not to think about it. Your are wasting your energy on somthing that really has no bearing on your life. For some reason this lady went to the effort of creating a very elborate 40 week lie so she must be very set on keeping this a secert. Why? Who knows but it is her life to live and not anyones place to tell her how to do so. So I would wish her the best and hope that she is now happy with her new family as it was seeming as her world was about to come crashing down. Try to see the good in the situation....the baby has a mom who truly wants and loves him. Focus on the good, let it gos, move on and out your energy into you and the ones you love