It's just that some comments that she's made in the past lead me to believe that she wants me to validate that I still want her. Almost like she wants me to pursue her, but that's probably not what's going on now.
I know from my own past experiences (before W) that e-mail is probably the worst medium to send anything remotely emotional - I think it comes second only to text messaging. You get this thing in your mailbox and you skim it to read it first, then you might sit and read it properly afterwards. Chances are she would feel overwhelmed by the content, even if she might respond favorably to a discussion along those lines when the time is right.
I wouldn't think about sending stuff like this to your W. You will know when the time is right to talk about things along those lines, when you are sure of the mood she is in and you can quickly and easily back out of the conversation if it becomes too much.
At least with my W, there are days when I instinctively know I can push a little, and days when I know it would blow up in my face. With an e-mail you just don't know what is in her head when she reads it.