At 6 years of age, she is just beginning to learn to write. Don't be too hard on her, she needs encouragement, not criticism. Her little hand is not used to doing such precise things yet. Make sure that she has lots of pieces of paper, and don't worry too much about what it looks like. I am very much older than she is, and my writing is still not "pretty".
She needs to have some fun with what she's doing. And, be sure to give her a big hug every time she tries to improve.
I am not a teacher.