Placebo effect. Believing in it may have been enough to get her over the hump.
Doubtful - she was in a delirium at that point and they were throwing all sort of stuff at her.
Given the above link about fake versions - My take is that it DOES work but 90% of the cases will recover anyway so the WHO is telling black nations to not bother because they’re like poor and stuff and the White Priveleged WHO can direct their money elsewhere.