The fact that she was diagnosed with IUGR indicates that it is likely she will display developmental disorders on a broad spectrum, and it is not suprising this is occurring. She should be evaluated right now by a developmental pediatrician.
To manage the behavior follow the instructions from Lynn Clark's book SOS Help for Parents (see www.sosprograms.com).
thanks. how do i control her temper tantrums..I am having a hard time disciplining her and everyone is putting input when they shouldnt. so for you as a doctor what would you say