Outwardly, Anri still looks like a Cool Beauty (shut up, she's totally a Cool Beauty, she'll sue) but inwardly she is STRUCK. Is she a bad sister? Sure, it took her a long time, but she properly learned Reira's name! (Although not until after adopting her.)

Oh no. Oh no. She's a BAD SISTER. Okay. Okay. She can still turn this around and be a cool big sister, right? Right. She'll just mentally rifle through her Item Box and there it is, she'll pull out a small envelope from her shadow (ignore the Ominous Latin Chanting as she does this, she can't turn that off) and hand it with all due ceremony to Reira.

"Here. Your allowance."

Yes. She's a Cool Big Sister.

Nailed it.