I have to be honest I screamed with pure delight! when I saw Caroline's name on the list!!!!
Serioulsy, IIRC she hasn't been to one of these since Danish Crown Prince Frederick married Mary Donaldson back in 2004 (8 years ago). I'll never forget that because that's when she wore the mysterious long-lost Brunswick Tiara (originally owned by Empress Josephine of France circa 1790's), shocking everyone, including moi!
Caroline of Hanover | Brunswick Tiara onced owened by Josephine Empress of France
Caroline von Hannover mit dem Braunschweigische Diadem
Joséphine de Beauharnais - Wikipedia, the free encyclopedia
Princess Caroline Pictures - Wedding Of Danish Crown Prince Frederik and Mary Donaldson - Zimbio
That said, if Albert & Charlene really do not show up I will be disappointed because they make a lovely couple, and also I've been spoilt seeing them at Victoria & Daniel's wedding, as well as Kate & William's.
If I had my wish I'd love to see Albert & Charlene representing Monaco (with Stephanie invited also) and Caroline as Hanover's representative (with one of her Hanoverian stepsons accompanying her, or even one of her daughters, one can dream, lol).
In fact I recall in the past Caroline showed up at a few high profile weddings with her Hanoverian husband, and her little brother Albert was there by himself representing Monaco.
IMHO enough time has passed since her unofficial split with Ernst-August that it's okay for Caroline to join high society again. Being a staunch Catholic herself, I believe Caroline will be married to Ernst till the bitter end, for better or worse, for better or worse...