What kinds of snacks does your DD like to eat at home? My favorite travel snacks are snack mix (I usually make homemade Chex mix and take it in a zip lock bag), Teddy Grahams, licorice, dry breakfast cereal, grapes, granola bars, cheese sticks (I suppose these would count as dairy though), fruit cups, pudding cups (make sure to pack plastic spoons), Ritz crackers and pepperoni slices.
I almost forgot, one of our most favorite take along snacks is...
Melt a pound of white almond bark and add...
1 box of Golden Grahams cereal (or generic graham cereal)
Approx. 3/4 jar of peanuts
Approx. 1/2 bag of pretzel sticks
Mix together until the amond bark covers it all. Spread on waxed paper to cool. Break up into small pieces as it cools. Store in a zip lock bag.