I seem to recall the tool tips for Ice Queen stating it has a bit more pierce defense than either Royal Jelly or Mercurial, indeed the current images on the Wiki also state this. I believe this set may have been tweaked to match up with those other 2 sets, my tool tips don't match up to the wiki like they used to. Can anyone else confirm or deny this?
If this was already known then apologies in advance.
The stats on the wiki are just screenshots provided by the players. Any time there's a discrepancy between in-game and the wiki, in-game wins. This probably means that the Ice Queen set was changed. You should get a screenshot, crop it, and upload it to help keep the wiki up to date.