I'm also in the camp that feels she is just expressing her own fears and insecurity. From the way you worded it at least, I didn't come away with the fact she was forbidding or discouraging you exploring your relationship, only that the shoe was now on the other foot and that SHE was being forced to deal with what you already have.
If that is in fact the case, just be kind. Remind her that you went through much the same thing and that the feeling eventually lessens or goes away. Make extra effort to express your love for her in little ways - OFTEN. That will help. Try to make sure the door for communication stays open. Encourage her to express her feelings and fears and make time to sit down and work through them together. Don't get defensive !