Holy moley that was long and convoluted but I got it done! I had to move our Christmas party to Thursday from Sunday but that wasn't much of a problem other than they couldn't refund my $6.xx because I had used my DVA to pay for it and they apparently can't refund to that. I said to the guy when he told me we WOULD get a refund (before he knew about the dva acct) that we could use it for a Dole Whip or something. Then, after he found out he couldn't get the money back to me we decided that was okay because we'd rather have the party on the night that works best than have the $6 so we made the change and left it at that. About 5 minutes after I got off the phone with him, he called me back and said he felt so bad about the $6 he was going to give me a # to take to guest services inside the park along with my ID and they would give me certificates for 6 Dole Whips!

So that was a pretty good trade-off!
THEN I had to call and make reservations for the EMM to zero out the balance in my DVA. The first lady at Disney dining said EMM wasn't coming up in her system so she transferred me over to events. That lady was working on getting the tickets for me but as soon as I mentioned paying with my dva she right away transferred me to guest relations. Guest relations couldn't understand why I had been transferred at all because EMM should be booked as dining. So she transferred me BACK to dining again. This time, the dining lady (a different one) was able to get the EMM booked. Again though, when I mentioned paying with a dva she first told me she couldn't do that. I told her I was just sure others had done this so I thought there should be a way. She seemed open to trying something so I suggested trying to run it as a gift card (thought I had remembered others doing that) and it worked! So I was able to use the balance on my dva plus a few bucks from my rewards card to pay for the EMM.

She was pleased that I taught her something new today.
EDIT: The whole time I was trying to get the EMM booked I was so scared it would sell out before I got it done. Then, when I first told the gal (the one that got it to work in the end) that I wanted to book it, I gave her 12/27 instead of 11/27, so when she said they weren't holding EMM that day I about passed out! Then I realized my error and we got it straight.
Phew, now I need a nap!