You've gotten some great advice. But, have you told her any of this? You are telling us, strangers on the internet. And, I can understand that need for unbiased feedback. But, we can only speculate what will be the right move for you and her. You need to be honest with her. She might not be ready for anything serious, but backing off doesn't make you any LESS serious. If she isn't read, then she isn't ready. It isn't YOUR fault that you are.
I have some serious walls I've put up. So does my fiance. We often can struggle because of this. We dated for 6 months and he never even indicated he thought about me outside of our visits. So, I finally wrote my feelings down on a piece of paper and left it for him. He found it, read it, and low-and-behold he'd been feeling the same way.
I'm not going to give you false hope and say that is how things are going to go. But I know as someone that has a VERY tough time opening up to anyone, sometimes honesty and communication is the best step.
The worst that can happen is she is not ready. And, if she isn't, do you really want to wait and wait until she is? And, if so, at least you're realistic with her. If you withdraw, back off, or otherwise remain silent on things, that isn't going to help. My fiance tells me that all the time. I will withdraw or react to these trivial things because I am SO scared to get attached to anything. And he will get aggravated and tell me "I'm not a mind reader". And it takes THAT happening for me to realize that I am reacting to scenarios I THINK might happen.
Again, your situation could be ENTIRELY different. But, just be straight with her. Maybe write it down in an email or letter. Let her process it. Let her reply in her own time. But don't be so intimidated or afraid to upset her that you stop being YOURSELF and being honest.
Best of luck! I am a hopeless romantic myself and fall HARD. I literally moved IN with a guy before we'd ever said "I love you". That was crazy to me, because I was saying it in my head daily. He didn't indicate he loved me until I opened up with him and he admitted he'd felt the same way for MONTHS. Had I opened up earlier on, maybe he would have opened up in turn.
Life is so confusing. There is no one right answer. The ONLY right answer that is true is honesty.