Because Tom Robinson (Helen's husband) was undergone a court trial because of a Raape accusation.
This tarnish the name of the Robinsons and make people do not want to associate with Helen in any way, which lead her unable to obtain jobs to support her three children.
Answer: Hijra 622nd year.
Explanation:
It represents the relocation of the Prophet Muhammad from Mecca to Medina. The reasons they brought were the pressure on members of Islam by other nations. Muslims were, therefore forced to abandon Mecca because of their religious beliefs.
There is evidence that Muslims have voluntarily left Mecca, but that information is misleading. Some sources say that Muslims were inhabited during that period, which was more than sufficient reason for Hijra.
Your answer is correct my friend <3