J.W.
I saw a program on this ..wish I could remember all they said about it . I do know that sometimes a full bladder and caffine can contribute to night terrors. Try cutting off liquids 3 hours before bed and eliminating all caffine from her diet. Also try putting her to sleep earlier. The more tired a child is , the more likely to have night terrors. I think the show also had 5 minutes of talking about things that bothered the child that day etc.. so they can "get it off their chest" before trying to go to sleep.
Night terrors are a legit sleep disorder so you should notify your pediatrician about it. They go away around 5-6 when kids are better at expressing themselves verbally.
Hope it helps !
J.