This was Princess Buttercup. From the day Lona picked her up, she loved her guinea pig.  Her name was Buttercup but we added Princess mostly because of the Princess Bride movie.  When she was little, Lona would curl up with her guinea pig and they would both fall asleep, Buttercup on her side nestled against Lona.  They would go outside together and Buttercup would devour grass often hoping all over not content to stay in one spot.  She was daring of the two guinea pigs and often got her way. One day, I walked by the guinea pigs' cage and Buttercup was on her side which wasn't unusual.  However she didn't jump up when I opened the cage and sadly she had passed away.