I don't think they would have gone back and edited her first nude showing. They would want future nudity to show that progression.Just a theory about Madalyn's change... I'm not following NLT's Patreon page or anything, so I may be wrong...
What if they changed her appearance because of a story adjustment ? Like because she does not have a supply to stay young anymore, age is catching up with her, and they wanted to start showing it ?