<< One of the teammates named Mary told me she had too much work because she needed to prepare her job interview , which was [something] unexpected. >> I think they're both grammatical, correct, and logical. I think the addition of "something" in the first sentence is useful, because it helps reduce ambiguity.
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janeleohi, clive. According to my knowledge in response to your second question,the whole sentence was unexpected.
your second thought is right. I agree that I might have been counting on Mary to be with the team on a particular occasion, and then she unexpectedly came up with this lame excuse; but in that case I would have found a different way to frame the