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There are two possible causes of death - the cold, and oxygen deprivation (if the cryotherapy clinic uses nitrogen and not refrigeration to produce the necessary cold temperatures). Neither one would have killed her instantaneously, but she probably lost consciousness and thus lost the ability to remove herself from the chamber.
On a more general level, the cause of death was that she used the cryotherapy equipment without any person or device available to rescue her when she lost consciousness. If it is a single user chamber a deadman switch could have saved her, but couldn't be made foolproof without adversely affecting the operation of the machine.
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