Eventually, Gabby would keep to herself for most of the day, and she wasn't interacting much with Grandma. Grandma wasn't able to eat much anymore, and had dropped too much weight. They were both nearing the end, and Gabby was ready.
Grandma took her to the vet and together they decided the best thing to do would be to put her to sleep. Grandma held Gabby and comforted her as she closed her eyes for the last time.
Grandma lost her best friend and, perhaps, her soul mate. After Gabby was gone, Grandma went home and took a nap on the couch. She never woke up.