Whoa, yep she needs professional trimming in an ASAP way. To get those cracks healed right its going to take time, but I bet with one good session you'll see a world of difference. Do your research and try to find the best in your area.
Good luck with her, keep us updated!
If you have any questions about nutritional care, mare/foal advice please feel free to ask! No shame in doing a good deed, many of us have been where you are, unfortunately...
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