It sounds to me like she wants you to push the boat out and wow her with a big gesture. You've gotta spoil your lady from time to time, and proposing is a big deal obviously!
How did you propose? Did you get down on one knee?
If not, maybe she wasn't convinced by the way you proposed to her, and that's why she's wondering how things will turn out down the line.
If you really love her and want to be with her, you've got to do something that will sweep her off her feet