I'm sure I'll be busy enough looking after Shinji...

[She doesn't think she could spend her time doing anything else. Making sure her cousin is comfortable is the only stress-free area of her life right now, and even that has drawbacks. Still, it's as close to relief as she's sounded so far.]

But you're right. If I'm occupied, I won't worry so much about her...

[Or perhaps more accurate, she can convince herself she's not worrying. It's almost as good as the real thing]

... Thank you, Shigaraki-san.

[For once she's going to leave a conversation feeling better than she did.]