[ The niceness is definitely weird. But Hilda hasn't been particularly nice to those closest to her as of late so maybe some part of her is trying to get herself back onto even footing.

Whatever her reasons are for being nice to Reno (also wait, she's been nice to him before. Why else would she dye someone else's hair?), it's surprising for her to hear him thank her and that shows on her face. ]

You're welcome.

[ There's probably an inflection at the end of that, but it's short lived. Some sass is clearly called for in this scenario. ]

Stop being stubborn and just take it. I have more of a costume than you. [ She pauses. ] Please? There's only a little bit of the night left. You can give it back to me next time. And it's meant to be an adjustable mask. It should fit around your loud mouth.