Haven't read all responses, so sorry if I repeat or something not relevant...
I agree to cut the 'junk food' out & feed her a healthy diet. Her toes especially, but entire hoof capsule appears flared. That means the laminae are either separated or stretched, likely from diet induced(that's the normal cause) laminitis and bad trimming. I would shorten the toes, and 'roll' or bevel them from the white line, to relieve the excess pressure on them, to allow them to start growing down well attached.It's hard to tell, but the heels appear long but crushed under - underslung. That is a likely cause or contributor to the crack. Removing the leverage at the toe will help them, as will shortening them gradually & often, but never into the sole. Ensure the entire hooves are kept in a strong 'mustang roll' to avoid excess leverage forces compromising the laminae further, & to prevent chipping. Boots or alternatives are definitely a good idea, to ensure her comfort, as may be frog support pads.
But the best piece of advice I know of is to educate yourself on hoof function & the factors that effect soundness. Especially if you live in the back of beyond & may have to rely on yourself if the 'experts' aren't good enough. Hoofrehab.com barefoothorse.com barehorsecare.com are among some of the good sites to begin your study.
Thanks for all the advice. I have tried to educate myself on barefoot trims somewhat, I have already bookmarked and read all the sites you mentioned, as well as I have Pete Ramey's book and Under the Horse DVD series, as well as a vet manual on lameness. As of yesterday Freyja is off all sweet feed, she's now just getting all they hay she wants free choice. I even took her off the beet pulp, because she's okay for weight now, just needs some muscle development.
I am keeping a good mustang roll on her feet, which I maintain myself on a weekly basis, although I don't do any of the trimming myself, I don't feel like I know enough to tackle that. I know there is still flaring and overgrowth on her feet, we are still addressing that, my trimmer comes out every four weeks, she just hasn't wanted to take off too much at once and leave Freyja too sensitive to walk on all four feet. You should have seen what we started with - she was darn near slipper feet, and really she's come a very long way in the almost 5 months I've had her. She was really kind of a last minute, impulse buy - I was buying my gelding and the seller offered the bred mare and colt at a price I couldn't refuse. I bought her thinking she would never be riding sound, so I can deal with her not being, but I still want to make her as comfortable as possible.