And the other foot is fine?
My guess is it was too tight, and it inhibited the circulation - not enough to kill the foot or cut off blood, but enough that it’s serious. And because the blood didn’t circulate like it should have, her foot became frozen and frostbitten.
My guess is it was too tight, and it inhibited the circulation - not enough to kill the foot or cut off blood, but enough that it’s serious. And because the blood didn’t circulate like it should have, her foot became frozen and frostbitten.