I'm not opposed to adding a cooldown on healing items for challenging mode, but making her sprite change from using healing items has been proposed before and is definitely not going to be added.
Aside from it logistically increasing the asset workload exponentially (just one state of bloatedness would mean ALL of bellagarths sprites would have to be done twice, and we're in the thousands now) I don't want to incentivize wasting healing items to get a kink thing. If you play well and dont need to use them often you'd just miss out on that part as well.