Her life to live

Once again, I have no idea what is going on with my daughter. Her boyfriend and his parents have invited her to go to Chicago with them for a weekend in Feb and she doesn't want to go. She told me it is because she don't like his parents but to be honest she doesn't even know them and this is a perfect opportunity to get to know them. I am afraid that she is going to blow this relationship if she isn't careful and some other will girl will grab him that will appreciate him and everything that he does. He is an excellent boyfriend as far as I am concerned and he knows that he needs to break down some walls that she has built around herself and I think this may be a very difficult thing for him to do. I believe that she likes this boy but now she is panicking and thinking that it is forever instead of learning to relax and have fun. This trip would be the perfect opportunity for her to do so but she is going to say no. This makes me frustrated but she is who she is and no one can change her. Her boyfriend told me not to make her come and I won't but I did encourage her to go but if she don't want to then she dont and  there is nothing that I can do about it.  I need to let her live her own life and if she blows the best thing that has ever happened to her then I guess she blows it. I think that she will regret it later though. When others go after her boyfriend or ex, she will realize that she had it really good with him. I told her that she needed to give this relationship a fighting chance like give it a few months to get to know him and see where it goes. Will she? I highly doubt it. But it is her life to live and I am staying out of it!