Plainly, wisdom was never imparted as part of her "Witch" training... which is odd, really; you'd think her gramma would've had some semblance of wit (or at least basic common sense) after living for a time.
My first question to any customer, when requested to supply the most powerful potion imaginable, would be:
"Is this for yourself or a client."
People create and delete other people over love; kingdoms become empires for love; the world changes itself, entire for love.
Maybe fuckin check first, bakamajo?!
And, in a practical sense, if they want to kill you for asking, they are ABSOLUTELY going to kill you after you make it; better to deal with that now, than be (very briefly) surprised later!