A bunch of good ideas guys, thanks!

So will setting DIL 1:1 extension number to a mailbox without an extension work? Since the only option was to enter an ext. number, not a VMB number I figured it wouldn't be possible. And even then it sounds like I will still need a telephone plugged in for this to work?

KLD, There is a Trunk Grp setting that would point a CO to a VMB similar to the way DIL works?

MrGemini, It's a KXTA so I guess the XDP thing is out. But I am not against changing her VMB number to something else.
And yes, this is a CO line that is dedicated to a person who does not have a phone. I could even give her an available extension, but leaving a phone plugged in somewhere for FWD'ing to work would be a poor solution.