Maybe she didn't fond out in time for it to kelp her. Maybe she weighed the odds and thought that if she presented the case that his supporters would never vote for her and thus hurt her case. Maybe the DNC told her to keep quiet since they thought he had a better chance than her.
Who knows. I do find it curious though that there is an emergency request in Hawaii to unseal his birth certificate and now this, and Obama suddenly needs to go to Hawaii on Thursday to see his seriously ill grandmother that got out of the hospital LAST WEEK. Her condition supposedly is 'grave', but he can out it off a few days, even though he didn't bother going when she was actually IN the hospital. This the woman that raised him when his own mother pretty much dumped him on his grandmother while she went back to Indonesia to live.
His half-sister, Maya Soetero Ng, visits the grandmother every day, reportedly.