I will try to relate to your daughter’s sudden onset nerve pain in feet. In mid-November, I had the same condition. I now have minor discomfort occassionaly.
I found online that it was shin tendonitis.

The medical sites said to just rest, elevate the foot and apply ice packs for about 15 minutes and repeat a few times a day. That fights the inflammation.
I also found it helpful to wear a compression sock during the day and take it off while sleeping. That reduces the swelling.

A major help was to have 2 cups of homemade bone broth per day to help rebuild the tendons. Bone broth has the protein collagen that is needed to repair the tendon damage. But I emphasis homemade. The store bought bone broth is water downed and does not have much collagen. I roast a chicken or turkey, cut off the meat when it comes out of the oven and place the bones and scraps in a large pot with water to the top of the bones and simmer for the rest of the day. It does freeze well.

In Australia, (Monash University), they say after a few days of rest, go with light, limited exercise and slowly increase the level of exercise.

In November, I thought the tendonitis was caused by overdoing the fall cleanup in the yard (1/2 acre). I did not blame it on Long Covid. However, after further review, it looks like LC may be the culprit.

From: Your Covid Recovery https://www.yourcovidrecovery.nhs.uk Muscle aches and pains are described as ‘myalgia’. It can involve your ligaments, tendons, soft tissues and it can also cause joint pain. Myalgia can be a common symptom if you have a viral infection such as COVID