Sounds like she never was given a tetanus shot? If that's the case stop by any vet clinic and get tetanus anti-toxin for her. Might not be needed, but where that's still open and doesn't look like it'll be completely healed anytime real soon... antitoxin would be a good idea to be on the safe side.

Not surprised the sutures on the leg didn't hold. They almost never do on a horse. The ones on the flank should have held though, but that's just luck, sometimes things don't go your way.

Careful with what you use on the cuts, use something that's not traumatic to the tissues for now. If proudflesh starts on the leg cut then there's plenty of stuff out there that will take care of it, but best to let it get a chance to heal right now. The one on the flank isn't at risk for proudflesh so use a topical ointment/spray that promotes healing, not one that prevents proudflesh.

LazyWP - I've heard from a vet that I have a lot of respect for that honey is good. She strongly recommends it.

Make sure you keep that foal on antibiotics; that leg cut could turn into a major mess, and if the joint gets infected...