There are many characters in the Bible that we don't much about, or their lives or work.... Just because the bible says she was a harlot, does not mean we need to know any more narrative about her as being a harlot, besides, the bible tells us that she stopped being a harlot when she decided to join Israel... Just because there are people in the bible, and the only thing it says, was that they were a .. i.e. a king, a horse care taker, a slave, tax collector, or whatever, does not mean we need to know everything about them, unless ? the bible goes more into what and who they are..... I don't waste my time on those things I can't figure out myself from the bible unless GOD would reveal it to me... How about the man who , when he saw the ARK about to fall to the ground off the cart, and touched the ARK, GOD smote him... do we know much about what he work or job was ? All we know is ? he touched the ARK, and was dead on the spot.. Lesson learned ? don't touch what GOD has made holy...
Actually, I am not convinced she ever was a 'harlot'. Not that I consider a 'harlot' committing the unpardonable 'sin'. However, I would at least expect to find something/anything given all that is Written about her to indicate something that gives credibility that she actually was a hooker. Instead what is Written about her is that she was a hard working, 'GOD' fearing woman that in spite of her city being destroyed, did what was right and was protected.
I don't know is there a Saint Rahab, or do people still refer to her as 'that' harlot?