Yes, I'd still provide food and water free choice. It's harder to gauge the crop when they have light 24/7 since they eat at all hours.Yes light on all night and day and have chick grit. Her crop is going down but is still full. Should I still give her food or let the crop flatten?
If the crop is going down, she's active and not in distress, then I'd say she's fine. Sometimes chicks can really fill the crop and it's just more noticeable.