mina is probably the only responsible member of her family who isn’t in cahoots with questionable folk, and she rarely uses her powers because she’s very easy to manipulate so the second option sounds good! she probably had suspicions about what he was up to, and against her greater judgment made a spirit tail him to see what he was up to? i imagine she would have been very devastated to discover the truth of what he was doing, because if it wasn’t for her family she ideally wouldn’t have exposure to the seedy side of things at all.