If that's the case, perhaps. Or maybe she just likes making up rules. There's certainly plenty of them.
The idea that simply telling robbers 'not to come' would somehow deter them. It's like putting up a notice saying 'No Murders Please', has a Monty Python quality about. Nothing to do with language.
The idea that you could somehow be made to beleive she hasn't ANY money in the house (despite being a very busy girl) when she's taking in £150 an hour ...
Not the cleverest in my book.