That's so interesting. I hope you locate her to find out for sure. You should put an article in the newspaper in her town, and hope tht she sees it. Good luck!
A nephew, that I didn't know existed found me when he was 30 years old, and that was so wonderful for our whole family, except my brother(who was his father at a very young age while in the Navy) . My nephew was so happy to know that he had a large and loving family.