As someone who has had both a GF/Mommy in the past and a Mommy friend, I can tell you that there are most certainly people out there who understand this and are more than willing to participate. From experience, my GF/Mommy was my exact age and my Mommy friend was a fair deal older.
Good looks? I think what is construed as attractive or good looking is dependent on the person, so that is highly subjective. Chances are, that if you find someone you like deeply enough to reveal this side of yourself to, then they're likely going to be very attractive in your eyes.
If you were talking to someone and their only reaction was that diapers aren't their thing, I think that's a fair reaction, some people get absolutely trounced when they reveal this side of themselves to the unaccepting/uninitiated. What does it mean? Simply put, she doesn't really dig anything diaper related. I would respect her decision and move on.
In answer to your update questions, I have heard of ABs and DLs who have partners that are willing to change them, but not participate any deeper/further, so like above, that's a distinct possibility. Once again, there are very loving, open-minded people out there who will accept this, the trick is finding them, there is no recipe for success in that regard, some meet this person through the community, some introduce a willing partner to this lifestyle/fetish/interest early on or down the line. I think I can vouch for most when I say, you're not gonna find someone overnight, unless you're the luckiest person alive. Take your time, go on dates, go to events in the community, have conversations, make connections and hopefully, you'll meet someone you hit it off with, someone you can reveal this to and someone who will be accommodating of your diapered needs
Best of luck