I wonder how much she's realised so far.
She's confirming her own feelings. When she realised just how sick he was, she took him to bed and tried to get his fever down. Then she set out to get him drinks, waking him and helping him with his glass. We see the evening progress and she sits by hkm, clearly worried. And then finally having him call her VERY intimately by her name (sans honorific, even) - and after the first shock, she thinks she LIKED IT, wants more... More does not come.
And now she ponders. Was this just me liking him? Does he like me back? Ne, senpai, if I kiss you now... Would you mind? Hate me for it?