I had to edit your question down.
Mayella is lonely. She has always been neglected by her father and has been forced to raise the children herself. She is alone. She seeks help from Tom because he is the only one that has offered to help her and Tom is the only character in the novel that has shown Mayella any affection or compassion.
We don’t really know what they may have discussed when Tom stopped to help. They might have discussed life on the poor side of town or just engaged in typical small talk. Tom took pity on her. Mayella eventually felt close enough to Tom to seduce him, so their conversations could have been more personal or intimate. But we can’t know this for sure. The bottom line is that she sought help from Tom because he is the only one who offered. We can only speculate that she also accepted Tom's help because he was someone decent she could talk to.