I dunno how someone would feel bad for Leysritt. She's on the couch 90% of the time, and only does the laundry (presumably on commercial breaks).
She's just following the slacker theory. Sella is eager to do the work initiatively, so Leysritt's role is to slack. After all, there's only so much you can do in a little house and with a meddlesome person like Shirou around to boot.