The descriptions, actions, and quotations given in the passage tell us that the subject is silly and she could not understand her conversation with the vet.
The given passage has been taken from "Bone Detective: The Story of Forensic Anthropologist Diane France, Lorraine Jean Hopping"
The passage talks about a conversation between the vet Mary and Diane. Diane was told that alginate was a pink gummy material used to make moulds of teeth.
Diane was silly and so innocent that she thought the same could be applied on humans. She used it on her tongue without even realising that is is meant for animals.
Therefore, the descriptions tell us that the subject was silly.
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