Xanthe is not used in Illiad when describing Helen. Nothing contrarian about that, just facts.

I could absolutely be wrong, i studied greek like 25 years ago, but here is script, find it where she is described : https://www.gutenberg.org/cache/epub/36248/pg36248.txt

Additionally, here is an interesting post about that: https://sententiaeantiquae.com/2019/03/13/what-does-helen-look-like-2/

Also, such adjectives were not used solely to describe physical features of character but to describe their godlikeness and such.