Founder can be dealt with. She needs to be on hay only, no rich grains or horse feeds. There are low-starch feeds out there if she needs feed or a simple vitamin mixed with hay pellets works well. Adding magnesium in her diet can help her body process the sugars found in hay and grass better, which will help prevent another founder episode. Before buying any supplements though, I would have the vet do x-rays to see how bad the founder was.
You can also manage founder using barefoot trimming techniques. You don't always need special shoes. If the rotation isn't too bad, then just trimming her to level out the coffin bone will improve her soundness. You'll need to show those x-rays to your farrier or trimmer so the feet can be trimmed or shod accordingly.
Here's a good web site from a well known barefoot trimmer that has had great success treating foundered horses without the use of shoes. Pete Ramey hoof care heals founder in horse’s navicular disease farrier