Rest In Peace to my cat Copper Girl

Thank you guys, it’s hard losing a pet, especially that young. The place that we had her cremated couldn’t believe a 6 year old cat past, Copper should’ve lived three times that long. We’re not sure what caused her death. Around two months ago, I was throwing her toy around for her to chase. She was running and enjoying batting her toy when she started acting odd like she was having a stroke or a seizure. We brought her into the ER Vet and they couldn’t find anything. Two weeks later, me brought her into our regular vet and they didn’t find anything. I’m thinking she had a heart attack. She weigh around 12 pounds but with her fur she was a big fluff ball.