I'm not sure if you're still interested in a response to your question, as it's from a few years ago, now, but I'm replying anyway
I have CIE, and am in my mid-twenties. I found it bothersome but not so bad as a teenager, though I have always been a very confident person. I have not dated much--but that's not because I haven't been asked!--those who I've dated haven't been so bothered by it, even though it's visible. My mom always told me that having something physically different helps "weed out" the jerks. Good people to date won't care what you look like!
As to improvement--well, I've not really had any improvement, in fact I think the appearance is *a little* worse, but this is balanced out by knowing how to care for it better/more effectively. I used to use Vaseline, but now I use Eucerin, and I have found the dryness and flakiness has greatly reduced. Really, I'm so amazed by this, b/c it's a very recent discovery for me.
If you're daughter ever wants someone to talk to, I'd be more than happy to hear from you. I know that as a kid, I would have loved to talk to someone who led a "normal" life who is only just beyond the teen years, as I am now.