Her excessive fear for almost everything

My girlfriend is the single child to working parents. Both are in banking professional. Though we are in a relationship for last eight months , it seems to succumb. This is due to her excessive fear and worry. She fears about pregnancy and child birth procedure, she fears my parents, our future living place. Sometimes she calls me up at midnight to tell me her worry if she gets admitted in a non so prestigious university. She always doubts me. If she calls me up and finds my phone busy she immediately doubts me. And I can not console her with my best efforts, she does not take my advising. I want to mention here that her father is always talks nonsense in front of her. He says that her future husband will push her over the hill and like this. He is contrary to our relationship and tries every method to break it. And for all these our relationship is deteriorating. Please suggest something to improve our relationship and give it a new life.