branguscowgirl":1pgwayh6 said:If this heifer is really special to you and you want to fix it, you need to get a professional hoof trimmer or a vet with a tilt table. They can trim and clean it up real well, and put a hoof epoxy of sort on it to seal it up. She can definitely get bacteria or fungus deep in the crack to create an infection. A professional can also give you an idea of the cause.
The flip side would be to do nothing and hope it gets well or cull her.
Good luck!