Uma and Beryl have been sniping at each other for about as long as the princesses have been characters in the comic--I'll offer this page from our 54th storyline, "Totenfeier," as recent evidence. But feel free to follow my advice from yesterday and go all the way back to our 24th storyline, "A Long, Long Trail A-Winding," if you'd like.
Sixty-Six - Hearts and Flowers