I have a 3 year old leghorn that's showing signs she might not be getting enough calcium. She's laying some incomplete/soft shelled eggs, and today she had a prolapsed vent. I feed good quality food (Scratch and Peck laying feed) and always have oyster shells available. I don't give a lot of treats. This started right after I switched everyone from growing feed to laying feed (same brand). This hen has had this laying feed before. Any idea what's causing this? Should I give her some tums to boost her calcium intake? She's been molting a little bit, too.