we did the Belladonna as MNK RNG DRK SCH WHM dualbox BRD. killing charmed players wasnt an option for us. Gravity seems to land fine, as soon as charm occured ----> sleep charmed player, uncharmed player moves belladonna away. Just dont feed it TP and keep charmed players out of range and she wont eat them. Enmity became an issue for the whm healing later, enmity wasn as much an issue for me as sch with aurorastorm up (Tupsimati) and Animus minuo for curing, tough i dont know how much -enmity our whm has (its not his main job by any means).
at one point boht melees were charmed because she spinned around. her hits arent that lethal and gravity + shadow band land very good.