(TMZ) - Amanda Bynes has been transferred to the UCLA Medical Center for further treatment of her mental illness, TMZ has learned.

Amanda was shielded by a blanket as she was taken Thursday from the psychiatric facility in Ventura County to UCLA.  TMZ is told her mom - who is now Amanda's temporary conservator - wanted the actress admitted to UCLA because it has one of the best psych facilities in the nation.

Sources tell TMZ that Amanda would have been transferred earlier but a bed wasn't available until Thursday.

As TMZ first reported ... Amanda has shown clear signs of schizophrenia, but doctors continue to perform tests to evaluate her condition.

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