I was thinking more of an, "inside" mockery.
Headcannon: As far as I know, the moon has had no significance to the general populace of the Solari. Which made
look like a problem child (which actually draws another similarity to
funnily enough). But because the Elders knew that the Lunari existed they should have been afraid of Diana and gotten rid of her. There are a few reasons why they may not have, the top two being that they didn't want to (I imagined Diana, despite her disagreements, had incredible potential to become an elder in the Solari. It would be a waste to remove her) and because they had believed that everything that was significant to the Lunari's existence was destroyed.
But then we have the Brand. Actually I think the crescent moon image appeared when she gained her power, while the circular sun image is a brand of the Solari.
Looking at her base skin in comparison to her dark valkyrie skin:
https://i.ytimg.com/vi/-vVitMqWQDc/maxresdefault.jpg
http://loldb.gameguyz.com/images/skins_big_skin_fid_path/diana-dark-valkyrie.jpg
The moon symbol is there on both while the sun symbol isn't.
This would mean that the Lunari weren't known to the current Solari. Which even further explains why the Solari never killed Diana before hand. They thought this moon thing was all fantasy!
This is even better than I had imagined! It's all so delightfully tragic!