[Might take more than one hit for that, but she'll get there eventually.]

[See? This scrawny little arms aren't completely without muscle! She's stronger than she looks. Plopping a mattress onto the floor like that means the blankets and things need to get fixed, so she starts on that without saying anything. Only to look up as Lightning talks.]

You don't have to thank me, what are sisters for?

[Be even more miserable than you already are, what else?]