I have not seen evidence of a single 1961-era document even hinting at the existence of an Ann Obama (I think you meant “Anna Obama”) who was NOT Stanley Ann Dunham Obama, while there are piles of documents, including INS files released in 2011 which affirm a baby born to SADO considered by the US INS to be the bigamously conceived child of BHO Sr and SADO.
Not only that, but one of those INS agents mentioned that Barack had gotten Stanley Ann Pregnant in his Memo. Looking for another mother is needlessly multiplying complications with very little evidence and to no benefit.
Stanley Ann's Aunt Virginia May Dunham Goeldner even said that Stanley Ann usually went by the name "Ann."
Virginia said her niece, who was called Ann, was actually named after her father because he wanted a boy so badly he named her Stanley before she was born. She said that throughout her life she went by her middle name of Ann.
http://www.sherwoodvoice.com/articles/2008/11/14/maumelle_monitor/living/liv01.txt
Now don't pay any attention to the part of the Story where it says "When Ann died at an early age, it was Virginia’s brother and sister-in-law who raised the future president."
The Guy that wrote that article got it wrong and corrected it in another article he wrote later that day. You can find links to both articles. Virginia Goeldner knows very well that Ann didn't die till much later because she describes her role as an anthropologist.
I did, sorry for the typo.