If "tomorrow" is relative to now, then "She knew that we were meeting tomorrow" is acceptable even if it was not "tomorrow" at time being reported (the time when she knew). It does not imply that the meeting has been cancelled. However, if "tomorrow" is relative to the time being reported (the time when she knew), and has now passed, then something like "the next day" or "the following day" should be used.
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LaboriousShe knew that we were meeting tomorrow.Context:
LaboriousSo you mean that if tomorrow is still tomorrow at the time of speaking/reporting, we could say "She knew that we were meeting tomorrow", but not "She knew that we were meeting the next day/the following day".Right.
LaboriousHowever, we could certainly say "She knew that we were meeting the next day or the following day" i