A baseball set (you did say “Bat” mitzvah, didn’t you?)
To be serious, though, I think a personal leather bound Tehillim with her name engraved on the cover, is a nice gift, as is some type of not too ornate jewelry (bracelet, pendantm earrings). Mishnah Berurah – IMO, no.
You need to know the kid, though. Maybe her bank account could use some help, if you are a clsoe relative. Or, barring all of these, a nice gift certificate to either a store she frequents, or to a Judaica store.