I am assuming you don't want D, and if not, then just don't bring it up at all. If she texts you about it then just ignore it. If she talks to you about it on the phone or in person, just say you're still sorting things through yourself and you're not ready for that. You don't want to agree with her that D is a good idea, and you don't want to do the opposite of that, IE- tell her that you are going to wait for her forever and hope she changes her mind. You want to be somewhere in the middle. Leave the door open to reconciliation, but make her think you're thinking about moving on too.
Her text to you is interesting, because my W has also recently used those exact same words (scared and confused). She's kind of in the same place as your W, thinking that moving on is best but still scared and confused about it.
