What is she drinking op? Lots of sugar in that? Is she drinking enough as a lot of people have said - hunger is usually dehydration.
Maybe smaller meal portions and more snacks?
Just to help you out and not claiming to be perfect at all but I can only tell you what I feed DS. He's a VERY tall and active 6 year old. Yesterday he had -
Breakfast - OJ, rice crispies, 1 tea cake with jam.
Snack - yoghurt covered raisins and a chopped Apple
Lunch - wholemeal sandwich (1 slice bread) with cheese, cucumber and Mayo. Cucumber sticks, carrot sticks, a yoghurt, blueberries and a kit Kat.
Snack - handful of pistachios (he loves nuts) and chopped kiwi
Dinner - chicken casserole full of veg with wholemeal rice and a refresher lolly for dessert.
DS is a fruitaholic like me so I find him very easy to feed.
I think the important thing is to make sure you are feeding her the right things.
A sandwich sounds ok but should have wholemeal bread, same for pasta. Orange juice is great but so many people opt for the cheaper stuff that is from concentrate and doesn't have the health benefits of real orange juice - just sugar and empty calories.
Let us know OP how you get on.