My horse Red also had a cut down to the bone recently.
I'm surprised the vet okay'ed you to hand walk her, or even trot her. Personally, I would NOT be doing any sort of exercise with your horse right now. She'd be on the stall rest. The more she moves, the more the wound moves, the slower it is going to heal.
For a deep bone injury, I would also personally still be wrapping it.
MINIMIZE how much you cold hose it. Any stimulation like that will encourage over-granulation (AKA proud flesh). Therefore, if you wrap it, the wound stays clean and you don't have to mess with cleaning it.
For 2 months on my boy, he was on stall rest and I changed the bandage every 2 days. I used silver sulfdiazine on the wound. When needed, I used hydrocortisone cream on any proud flesh. BAndaging was also a good idea in my case because he got hurt at the end of August and the flies were just nuts. Keeping it wrapped was an easy solution to keep the flies off it.
When I transitioned to finally being done bandaging it, I tried Underwoods and I was NOT happy with the swelling reaction I got on the wound. I know there are those that speak volumes about Underwoods but I was not impressed, and thought the general wound cream I had worked much better.
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It is not enough to know how to ride; one must know how to fall.