Also, be sure to get the Happy Birthday buttons for your Mom (we got our Anniversary ones) when we checked into PPH, however you can pick them up at City Hall I believe. We had people (CMs and guests) wishing us Happy Anniversary all weekend long which was really cool, and The Fairy Godmother also signed our autograph book "Happy 1st Anniversary!" Also a lot of the characters asked about our anniversary as well.
We had a nice anniversary lunch at Cafe Orleans, and they brought us Mickey Beignets at the end of our meal, and also at Goofy's Kitchen they brought us cupcakes (that weren't the kind on the buffet).
I think any of the sit-down restaurants would be nice in the park, or if you really want to splurge how bout the Napa Rose since you are staying at the GCH? Or maybe book your Mom some spa services? I'm sure Mom would love a massage after a few days in the park (I know I did, LOL.)