Uh...seems like senpai lost the eye for good, hope is not the case and is just slow and careful healing, she was a bit crazy but can be fixed.
Kouhai brain seems to be even more scrambled, her crazy laugh out of nowhere was pretty shocking.
This girls had their fair share of problems, is a pity if the injuries are permanent, hell, kouhai did nothing wrong to start with, giving someone a box of keys is ok, and MC didn't even had the time to refuse her.