Are all liars incorrigible?

Article: The Liar

In this article, author walks us through her childhood. When she was a child she had stolen a watch of her friend's and had to tell a lie to her mother that it was gifted to her. She(author) quotes that, this was her first lie.

A few days after, she was enrolled in a private school. Here for every mischievous thing she did, she was taken to all teachers room and was thought how to lie. In fact she was spanked every time she was taken to teachers room.

One fine day she tells all her notorious things to her mother and her mother gets surprised. But to authors surprise her mother reveals a story to her.

Author concludes the passage with the context of confabulation which her mother with during the days of her dying. She tells us that there are people who tell lies willingly but that is not necessarily true. There are even people who tell lies unwillingly or to be simple, they tell lies not to deceive others but to fill some gap in their memory.

My opinion: Till the last extract the story was good. But I was not able to synchronize a connection with the rest of the passage and the last extract. These are the few which I inferred from the passage.

1. May be the author feels guilty of hiding all these facts from her mother.
2. May be the author suggests the readers not to adjudge people who seem to be incorrigible liars.
3. May be the author wants to suggest that children at a very tender age have confabulation.

There can also be a conclusion which I was not able to extrapolate, not to mention this passage had a sad and abrupt ending. 

You can read the article from here:  The Liar