They sometimes do eat quite a bit and look like that.
Have you given them any treats?
If you have any chick grit you can offer that free choice just in case she has eaten any bedding.
Ideally the best way to check to see if her crop is emptying properly is to check her crop, remove the food for several hours and then check her crop again, if it is empty or has gone down quite a bit, then it is functioning properly.
Is she still wheezing?