1) She doesn't like characters.
2) She no longer sings the cute songs in Mandarin she sang last year.
3) She cries because she doesn't understand what's going on in class.
4) You dread asking if she has any Chinese homework.
5) All the kids in her class have a Chinese tutor or a Chinese parent.
6) She looks at you and says: "I wish you were Chinese." She's not joking.