A couple of weeks ago I posted on here about my ex-bat hen Patsy who had been laying thin shelled eggs and then eating them. This has continued, only she eats her own eggs the other chickens dont join in and she doesnt eat other chickens' eggs. Today I notived some blood in the nest box, not a lot but some little spots around on the bedding. I went to check over the girls and found that Patsy has blood coming from her vent. What could this be and how do I deal with it? Help please!