With my chicks when they suddenly had HUGE crops I fretted, and then found out that chicks can be very GREEDY and stuff their crops to what seems to be bursting proportions! I would venture to guess your girl is just being a normal, greedy chick and will pass the food normally. They especially eat a lot before nighttime, it seems, so they can digest it all slowly during the night. Is she lethargic, have bad breath, etc?
If you are really worried maybe provide her with appropriate sized grit. Grit helps grind up food in their gizzard, helping along the passage of food from the crop.
