Or just unloved by the child that owned it.
He's taking the knife out of the Cheese!
Do you think he wants some cheese?

Remember what King Moonracer explained to Rudolph? "A toy is never truly happy until it is loved by a child."
The doll wasn't defective, just unwanted. Maybe she sat for years on a toy shop shelf.

She was unloved.
He's taking the knife out of the Cheese!
Do you think he wants some cheese?

http://worldofpopculture.com/2015/11/what-was-wrong-with-rudolphs-dolly-for-sue/
In 2007, on NPRs Wait Wait, Dont Tell Me, Rudolph producer Arthur Rankin Jr., said that Dollys problem was psychological, and was caused from being abandoned by her mistress (Sue?) and suffering depression from feeling unloved. Backing that up, when sold at CVS in 1998, her tag said Im a little rag doll who just wants a friend. I think that will help my broken heart mend. The reality: She was a last-minute add-on misfit toy so the young girls watching had a toy they could relate to.

You see that evil will always triumph, because good is dumb.