We went with our then 2 1/2 yr old DS over President's Day weekend 2004. We were pleasantly surprised with how good the food was. It wasn't gourmet, but it was very good buffet food. The character interaction was great, though it took some time for them to get to us. I didn't have a problem with it though - I thought they did a good job considering all the people there. The only thing that was the slightest bit anoying was how long it took to get seated with our ADRs. I can't remember what our time was or how long we waited, but it took awhile. This was trying with a 2 yr old but maybe isn't a worry for you since it's just you and your mom.
Have fun!