Could it be that she didn’t want to produce the divorce until the last minute because she might have appeared to be a bigamist? On her passport files, she gave different dates for her marriage to Lolo. One date was prior to the date that her marriage to BHO was finalized. If she didn’t wait for the final decree, then wouldn’t she be a bigamist? She may have got away with it because the INS didn’t pay close attention to the date the divorce was final versus when she married Lolo (possibly within the same month, depending upon which date you accept as true. It seems unlikely that a woman forgets when she married, but everything about these people seems unlikely.)
IIRC, the incorrect 1964 Lolo marriage date (as opposed to the documented (IIRC) 1965 Lolo marriage date) was on a passport document a decade later and could easily have been a “brain-fart.”
In 1965, there is no evidence that on presentation of the divorce decree from BHO Sr. the INS concluded there was bigamy, thus it would appear there was no evidence of bigamy by Stanley Ann in the Lolo INS files (not Sr. who was bigamous, IMO).