Poor quality since this was an instgram video done outside.
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Anyway, she might not actually have a name or be referred to by a name in the movie.
If someone I know is named Jacob, I don't call out Jacob every time I see Jacob, I just talk to Jacob.
So if she's a classmate I don't see Peter or Ned constantly saying "Hey Michele", "This is so funny Michele", "Michele where you going" etc. They're gonna be like "Hey what's up" "blah blah hobbies, blah blah party, blah blah homecoming" They may even have Peter ask who she is, and Ned say something like "I think it's Michele or something with an M"
I think if everyone's name is mentioned at least once, but we still don't know Zendaya's character's name towards the end of the movie or aren't sure, that should give the audience a hint that a reveal is coming, and that's when her real name is revealed.