The calcium citrate with D 300 mg up to 600 mg is fine, and could help her lay if she is egg bound. What is the temperature there? Do you have good ventilation and enough nest boxes? I would offer her a small cup of mushy wet chicken feed and a little more egg to her beak. Check her crop first thing at daylight before she eats or drinks to see if her crop has emptied overnight. Is she interacting some with the other chickens today? What do her poops look like?
