I think Marie would think something that is a misfortune to her would be the same to Nick as well. I don't think that's bad reasoning at all and she has more of a right to say that to him than anyone else. She's been a Grimm for decades and she probably believes Nick isn't quite ready for it but it's something he's going to have to live it. After all, she didn't tell him not to be a Grimm.
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