Tenses are often simplified in subordinate clauses, especially from future to present. This could read this will be the first time she will have watched...
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I don't think 'future tense' goes together with 'present perfect tense'Actually, it does. Present, Future, Present Perfect, and Future Perfect go together to form the "Present Point of View".go along.
I have to put "will" between "she" and "have"?No. Mr. M. was just saying that the meaning is the same with has or with will have. But have alone is wrong, as GG has already said above.