[Slightly disappointed in her brother for going overboard with the person they are about to train and knocking him unconscious.] 

You’ve done it again, haven’t you?

[Speaking to Tanjiro bluntly after he seems surprised at the thought of her training him. She says this with a smile on her face.] 

I’ve never met anyone weaker than me until you. You have to be the most pathetic weak boy I've ever met. It’ll be a fun challenge training you.

[She was asked something she has no idea the answer to. She is bored of talking and wants to begin the training now.] 

I don’t know. Now start training.