How do you correct a girl?

Answer 1

Gentle persuasion /motivation can compel a girl to attempt to remedy one of her flaws, but beyond that, there is nothing you can do. Either dump the girl or embrace her flaws!

Another Answer:

The one above is true. You can try to kindly show her about her flaw (but sandwich that kind pointer between two compliments on her strengths. Smother it if you have to) but remember, we cannot change anyone. We can calmly reason, instruct and reveal but we can't make them change. If you find that whatever she is doing is something you can't agree with and she won't change, then move on. No reason to ever force a relationship to work (unless you already said "I do").