Lillian found 9 of the mushrooms were safe, so there were 32 - 9 = <<32-9=23>>23 that she found poisonous or uncertain.
She knew twice the amount she ate were poisonous, so she found 9 * 2 = <<9*2=18>>18 poisonous mushrooms.
Thus, she was uncertain about 23 - 18 = <<23-18=5>>5 mushrooms.
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