Did you? I posted the documents this so called information came from.
I'm assuming the memo that was truncated by the author, who apparently had the (unredacted) INS file for two years before her book was published, indicates the name Miss or Mrs Dan...wasn't a reference to Stanley Ann Dunham. The memo released to Heather Smathers has that entire sentence deleted. The date is in April, 1961. We are expected to believe an adoption was being discussed quite some time before the dubious birthdate of August 4.
All that isn't grounds to hang any identification on, neither the mother, nor what would have been the unborn child.
Sally Jacobs obtained the memos for her book. She says the reference is to “Miss Dunham”, which is the only young woman [in HI] Obama Sr claimed to marry and impregnate.