You need to hone your kid's writing skills and it's early signs comes with your kiddo's willingness to write letters on her own instead of copying from an example given to her.
What you need to know:
At this point, your kid no longer needs you to show her letters. You say a letter to her and ask her to write the letter as you speak. Her writing skills will largely depend on how comfortable she is writing and not copying letters and words from any other source. Bring her a writing book so that she can write letters and practice them to improve her handwriting as well as the knowledge of letters.