Arc 4 explains in Maria's diary that Beatrice would play pranks on everyone else with Maria and sometimes these pranks didn't work.
So yeah Maria is 100% able to participate in a magic trick.
Maria isn't as stupid as you make her to be. Arc 4 goes a lot into how she's actually very mature and choses to perceive things that way, something that Ange grows to admire and see as a strenght.
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