You need to have a conversation with her during the day.
Also there is nothing wrong with telling her you really need to be able to sleep at night, so you 2 need to figure out how to solve this.
Have her tell you what she feels like when she wakes up.
I do think some kids go through bad dreams. They can come in clusters.
Usually they are triggered by something. An event, worry, imagination.
What has changed? Is she getting ready for school? How was her school at the end o f the last school year? Does she have friends? Is she worried she will not know anyone in her class? Is she a perfectionist that worries a lot?
Also I noticed that sometimes,when our daughter was about to go through a growing spurt she would have a few bad dreams.
My mother told me that whenever I had a bed dream to roll over. The dreams would go away. It worked great.
Our daughter used dream coins since she was little, but your daughter may be too old for them. You place a coin under your pillow and it takes the bad dreams away.
Our daughter also had a CD player with music or books on CD that helped her calm down and feel safe.
DO NOT ALLOW HER IN YOUR BED!
If you are married, have your husband take turns so it does not always fall on you. He can say, "Mommy needs to sleep, she is exhausted"