It is a rather arbitrary rule, especially as the miscarriage fell short by not long. My suggestion is to go to her doctor and get a medical certificate. Then apply for jobseeker for temporary illness, there's no sickness benefit anymore.
I LOVE being barefoot, although I usually conform to social norms and, begrudgingly, wear them when I go out anywhere. I think it's a personal choice and adults should be able to be able to make that decision, and take the risk, for themselves.