Don't be a Liar

I think that Miss Mayella is a liar because Tom is partly hadicapped therefor he could have not done what she said he did. The only thing that he could've done that she would have found offensive is not take the money that he was offered for chopping wood and such.
In society today I still think that there are people who do lie like that about people and I really don't like it because in my beliefs lying is a sin and you shouldn't do it. Especially if someone has done a good deed you you. Is that agreeable????