It seems there is an easy way to tell if its true or not. According to this quote...
Quote:
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The two children who appear next to the flower bed will ask where the flower girl is, but will then notice the cat (Cait Sith) in your group. They will ask to play with the cat, and Cait will agree to it and leave the church with the children. The ghost of Aeris will then appear before you. She will mention the resurrect spell (which you should already have), and will tell you to go to the Ancient City,
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you can do the tissue bit beside the bed and then visit the church before wasting time trying to level up materia that prob won't work, as from what is written in the quote you don't have to have the resurrect when you speak to Aeris. If whats above happens, then its true, if not it isn't.