Very interesting to be sure. It looks to me like the original color was blue, then covered in white...
Like you say, if it doesn't bother you, then that's fine
At least you can still spot her quickly. Personally, I always mark my queens with a neon pink, that color Really stands out. I'm not concerned with how old she is unless she's slowing way down.
However, if you were guaranteed a new marked queen specifically for that year, and the breeders covered a two year old queen with dot with the following year... well that would seem like a jip to me... and I might not trust those queen breeders again.
Good eye Wfarm! My eyesight probably wouldn't have picked that up