The type of shamanism Liz practice's is called Core Shamanism.  Core shamanism is near universal method and draws from many different traditions which allows her to be very adaptable to the needs of her clients and their different situations.  You can read more about Liz here.

Through the journey into the non-ordinary world of spirit, the shaman gains knowledge, understanding, facts, and power, to be able to affect healings.  What distinguishes the shaman from other types of healers, medicine men and women, is the shamanic journey into the spirit world where he/she travels to interact directly with the spirits.  The term "shaman" (pronounced SHAH-mahn) comes from a Siberian tribal word for this type of a practitioner and is translated into "one who sees in the dark" and "magician or healer."  Shamans typically devote their lives to their path and spend many years gaining the knowledge, power and skills required for their work.  In tribal societies, a person was considered a shaman when he/she could affect results, if he/she could not get results, word would quickly get around and no one would call on them any more. 

Shamans were, and still are today, called in to heal the spiritual aspect of any manner of  illness, disease, or disharmony of person, place or thing, as well as to divine information.