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Taking credit for the work of people who are barely even credited in the first place is… a way of responding. If only she had disappeared behind the curtain for a moment, re-emerging with everyone there with big hair and guitars and eye shadow and screamed “we are McCarty and the Et Als!!!”
Oh well; next time.
She drew attention to her being the/an author of the paper rather than just being a naming coincidence (or family relation, etc).
Adding the et al was likely for that effect, rather than an attempt to take credit for other authors’ work, imo