MaryPoppins,
There are quite a few dining places at Universal Studios / Islands and CityWalk. One thing I would recommend is Universal's Meal Deal Tickets. It's $24.99 for an adult (aged 10+) or $11.99 for a child (aged 3-9) and they can eat unlimited at a total of 6 convenient restaurants within the two theme parks. They have the choice of an entree and a side or entree and a a dessert. They can eat from 11 or 11:30 AM until 30 minutes prior to the park closing. I take advantage of it when I go to the parks with my family and we save a lot of money. My daughter, who also turned 9, is also very picky and sometimes she tries something and wasn't happy. So, we had to throw that away. With the Meal Deal option, we went back up and got her something new without having to spend more money. That's one thing I would recommend and if you don't do it 4 days, definitely give it a try one day.
Sorry if I couldn't help that much, but that's what I would recommend. I've been going to the parks since 2000 and we take advantage of the Meal Deal options 99% of the time. The only thing we had to purchase were beverages, but with that, we opted in and purchased souvenir cups for $9 and that allowed for unlimited refills throughout the day with our meal deal wristband.