@tigerstar186 - I'm guessing he just couldn't figure out how to see if the kitten was breathing. Or, if it was very slight, he would've missed it because he was prepared for it to be dead - cognitive bias, kinda.
Taking a guess:
She's shit at using mana and releases a lot of it while healing the cat, it'll give the brother+loli a lead/trace that lets them find her or a path/portal/anomaly that leads to Nihongo.
Bonus points if she faints or gets sick from using magic.
I thought she said healing magic only aids in healing and provides a bit of stamina and pain relief. Not the kind that can fix problems just aid in recovery.