Ideas
birdea_yt Please remove her various CAS parts until you find the culprit. The first suspect is nails, as there's an existing bug report for one nail swatch causing this issue:
[CONSOLE] Short dirty nail swatch causing Sim to look metallic | EA Forums - 12299478
If your issue is the same, I can merge your post with that thread. Otherwise, it would be useful to know what other assets are causing the issue.
Thats seems to be it. I didnt even see the thread (but Im also not on console so I didnt check for that keyword). Its worth noting I had the nails for several in game and irl days with no issues and it only happened a short time after I changed her swimming outfit and gave her the shine skin detail, which is why I assumed it was that. changing the nails immediately fixed it. pity I love those :D
Thanks for the help!