I agree it is a little strange but dying your hair works kinda the same way as you wash your hair.

https://www.youtube.com/watch?v=kOIj7AgonHM&ab_channel=VideoFromSpace

The other part that is a little hard to explain, could be makeup like the orange man uses.

Or maybe they were spending alot of time in front of the windows?

The windows are designed to block most uv radiation, but perhaps they let a little bit through so the astronauts can get some vitamin d without having to consume it all the time. :shrugs:

I did find this quote from her which makes me curious.

https://www.espn.com/espn/story/_/id/44192592/astronaut-suni-williams-starliner-runs-international-space-station-return-earth

Nov 11, 2024

"I heard some funny rumor that some doctor was worried about me up here -- not eating enough, bad air (maybe he meant Hair), and other silly nonsense. Well, I am happy to report I am eating like a horse, probably lifting almost 200 lbs for squats and deadlifts, crushing interval running at 90% of my body weight and working bike circuits harder than I ever have before. So -- I am fine. No, I don't have any more tan lines to speak of, people fart a lot here adding methane to the air, and my grey hair looks a little like Cruella. I think you guys know me well enough -- I can deal with all that no problem (I have an older brother, a husband and a chocolate lab to thank for this farty air preparation) -- I am fine, so help me dispel that fake news...or just ignore it."

Yeah, she sounds like a fellow ohioan to me, lmao.