When the weather turned warmer Mrs. Tall came out. After so long in bed her face was deathly white, and she swayed from side to side. She held a cane in her right hand and kept her elbow bent in front of her. Her half-paralysed left leg made walking difficult. She had obviously had a stroke. Every morning and every evening Mr. Short helped her twice round the yard, painfully and slowly. By hunching up his shoulders he was able to grip her crooked arm in both hands. It was hard for him, but he smiled to encourage her. As she couldn't raise her left foot, he tied a rope round it and pulled this up when she wanted to take a step forward.

What can we infer about Mrs. Tall's health condition from this excerpt?
It is a permanent condition
Mr. Short shares the same condition
She is expected to improve
It is very unusual

It is a permanent condition.

Based on the provided information, we can infer that Mrs. Tall's health condition is most likely a permanent one. The description of her face being deathly white, swaying from side to side, and her half-paralyzed left leg suggest that she has suffered from a stroke. Additionally, the fact that she requires assistance from Mr. Short and the use of a cane and rope to aid in walking indicates that her condition is likely to be long-term or permanent. There is no indication that Mr. Short shares the same condition, that Mrs. Tall is expected to improve, or that her condition is very unusual.