Honestly speaking i've always thought her healing powers are way stronger in the anime than here.

They could implement the pajama version of karin, the one that heals tsunade, with a passive that says something like: every time she uses her mystery or her chase she self damages to a certain % of total hp and heals the ally with the lowest hp by the same quantity, clearing all their debuffs. Can be triggered up to 2 times per round.