"The Medicine Buddha mantra is held to be extremely powerful for healing of physical illnesses and purification of negative karma. One form of practice based on the Medicine Buddha is done when one is stricken by disease. The patient is to recite the long Medicine Buddha mantra 108 times over a glass of water. The water is now believed to be blessed by the power of the mantra and the blessing of the Medicine Buddha himself, and the patient is to drink the water. This practice is then repeated each day until the illness is cured." &smash; Wikipedia entry for Medicine Buddha.
This only works via the placebo effect after a lot of Buddhist mindful practice including hours of meditation and receiving tantric rituals regarding the Buddha i.e. the long process involved in becoming one with the Buddha.
It does not work if the disciple has doubts about the practice, but since she has already found her riot Vajra master, all doubt has been removed.
Nothing in the text quoted is that magical. For with belief anything is possible.