In To Kill a Mockingbird, why does Mayella seek help from Tom Robinson on so many occasions?

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.