romanchronicles is an OC vampiress with that exact problem! I can’t find the post she goes into detail about it, but that is basically what happened. I bet the mun and muse would love to entertain your questions/amusements about it.

…However, as far as Ricean vampires go, I don’t think that would be a problem at all, as they can cut their hair post-turning, and it grows back to the length it was when they died. Hence, they can cut out that bad dye job; and since dye doesn’t exist in the flesh itself, their hair would grow back fine! 

The issue would be if someone had shaved their head before turning, bc their hair would stay that length after death 😛 Sorry Uncle Fester, it ain’t coming back.