Hi, @macmanx. The original domain mapping was paid for by a later-added admin on the site, and the page indicated that it had gone through, although the mapping wasn't working. Here's her confirmation email:
From: WordPress.com Upgrades [mailto:firstname.lastname@example.org]
Sent: Wednesday, May 01, 2013 9:27 PM
To: Higgins, Geri Ann.
Subject: WordPress.com Payment Receipt
Your WordPress.com Upgrade was purchased successfully.
Item: Site Redirect for http://fullypresentwithyou.wordpress.com
Purchased By: GeriAnn Higgins
I went in this morning and completed another transaction and now the mapping works fine. (Is that because I'm the primary account holder?) Anyway, is it possible to get her card credited? The blog shows two mapping entries. Perhaps the "help" email address?