Generally, anything that doesn't upset your stomach is fine for a pre-meet meal. For example, orange juice or any other acidic juice can be bad for some people. As strenuous as gymnastics can be, it doesn't really require carb-loading, which only works a few times a year anyway.
I would suggest a favorite breakfast to put dd in a positive mood, so eggs would seem to work for you. Fruit is also a natural pick me up. You might also want to tuck a banana. some seedless grapes and/or an energy bar in the gear bag for between-event snacking. And don't forget the water!
