Hmm I think she is telling the truth about her weight. I think she is honest and worked hard and did it, but was just unhealthy about it.
I don't know if this will help put the "Dedication" picture post into perspective or make it worse, but looking at those photos I think 74 lbs is an unrealistic #. If she's 181 in the first pic, and that's her honest weight, there's no way that same frame is 107 in the second one. Not trying to attack that poster, just being honest.