That's cause there's an option for 'max melee' (and mage/range) on the rotten potato and if you click it it kits you out in malevolent, max cape and drygore maces
I gave her the crystal wand/orb/staff/ward and got the seeds, tried using them on her, it doesn't even say nothing interesting happens and there's no dialog while they're in my invo as weapons or seeds, only the option to open her seed storage