I’ll leave suggestions about extruded or pelleted rations to the experts, but as long as her appetite has picked up, I would think access to grass hay that she can munch on for hours would give her extra calories without the danger of laminitis. Perhaps hang a slow feeder bag in the evening, so she can snack all night?
As for her right front foot (apparently the most affected one), you’ll know more when you get the xrays. I’m glad you’re getting those done because they will help reveal just what exactly is going on. With more information, you, your vet and farrier can be more confident in formulating a plan regarding her feet and her feed.
She is looking so much better!