Why do you assume her date of birth is wrong? I put her birth details on Reply#24. Although the birth is in the September Quarter, they may have been a bit late in registering the birth and it went into the September Quarter.
The only way to definitely verify her date of birth is to obtain her birth cert. from the GRO which will cost £11.00
If someone on the 1939 dies abroad then the record won't appear until 100 years have gone by from the birth year. That would mean waiting until 2031/2032 for her details to be revealed.
Did you wish to try following up the link I gave you regarding Pan Am Airlines?