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No You merely need to ensure the reader understands who is thinking, and that the text is thought. E.g. "Trevor stood before her, like an ebony sculpture, even more imposing than she remembered....
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/38004 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
No You merely need to ensure the reader understands who is thinking, and that the text is thought. E.g. "Trevor stood before her, like an ebony sculpture, even more imposing than she remembered._Gods, my father hasn't changed._ Morgan thought to herself." or "Trevor stood before her, like an ebony sculpture, even more imposing than she remembered._Gods, my father hasn't changed._ The thought sluiced through Morgan's mind. or "Trevor stood before Morgan, erasing her preoccupations. He was an ebony sculpture, even more imposing than she remembered._Gods, my father hasn't changed..._" or "_Gods, my father hasn't changed..._ The thought came unbidden as Trevor stood before her; an ebony sculpture, even more imposing than she remembered." etc, etc, etc