I would imagine the grudge would be extracted upon her without her knowing what's going on or why, like in Holic. Doumeki just started feeling something in his eye and then eventually couldn't open in beneath the web. So she wouldn't know, but after you update with both your characters I can make a spiderlady entry alluding very vaguely to it, so she can either figure it out or begin to suspect or ignore it completely, whatever works for you.