Thank you all! She doesn't know I'm thinking of firing her . I think I will take BK mom advice, don't give her one month notice. Actually, I keep her out of sympathy. My son loves her very much; however, both I and my husband feel that keeping her is not good for my son's development. She is nice, obedient and not so foolish. The weakness are: always follows my son's "instructions"; very poor english! Now, i will suggest all moms to employ a bun bun instead of yan yan if u have a little kid (2-8).