Michael Obama was not the first person to say your word is your bond and so forth.
I really doubt anyone checked out prior speeches for Mrs. Trump. Probably they just wrote the best applicable speech and that was it.
Some of the quotes of parents and thoughts on issues are generational as well.
Sure, no one individual phrase is unique—it is all platitudes.
But stringing them together in that similarity like that, from the last first lady’s speech—which you know any competent speechwriter would have studied—is beyond coincidence.
That said, it is very, very unlikely that Melania was involved in the cribbing. She was more likely the victim than the perpetrator.