Hers was the hardest for me even though she was an old lady of thirteen , because it was an accident , and I feel I could have , should have , saved her , if I had only checked on her earlier . Somehow her hind legs had slipped off the back deck , under the chicken wire fencing . Her hips were weak , and she could n't pull herself up . And that 's how I found her , just hanging there .

Based on the preceding passage, choose your answer for question Why was she an old lady of 13 ?
Pick from: [i] None of the above choices . [ii] She had progeria . [iii] She was diseased and was a young girl but was ill . [iv] She was a dog and dogs do n't live very long .
The answer is:
[iv]