Here, I’ll take a stab at this. Sad Turtle loved another turtle once. That other turtle made her very happy, but one day he said he was going on a vacation and never came back. Feeling like a shell of her former self (pun intended) Sad Turtle soon after became very ill and suffered by herself for many months. Even though Sad Turtle knew that she had an incurable condition, she kept smiling. In the past, Sad Turtle was always there to help other turtles out in their time of need, but was very surprised to find out that very few turtles were willing to do the same for her. But Sad Turtle continued to do nice things because more turtles in this world need to smile. Sad Turtle thinks that making turtles happy is the most important thing one can do, even when the same turtles make her cry. Sometimes when Sad Turtle is very lonely she looks at herself in the mirror and pretends she has a friend. It’s a girl turtle, by the way. Short claws, short tail. Wistful expression makes me think she’s been in pain for some time.