You will probably get WAY different answers than I give. My horses almost always have chips and small cracks in their hooves. How dry or wet is it there? Moisture or lack of moisture will affect the hooves a great deal. If you look at a horse in the wild....true wild, not just pasture buddy....they chip their hooves off naturally which is how they stay trimmed. It doesn't LOOK nice or pretty, but it's pretty natural. What is the cement covered with? If it's just bedding, then the cement can cause some chipping too. I've never known chipping to be a result of trimming too short....although I could be wrong on that one. If she isn't lame or favoring her feet a lot, I personally wouldn't worry about it.