idk I think the rest of y'all are crazy.
Keiko's definitely (I'm 100% convinced) not going anywhere permanently. She's most definitely not moving out. If she was, there would have been at least one sideways glance, or distance-gaze, from either of them. But there wasn't. Plus, the whole atmosphere is incredibly playful...i.e. it suggests she's going somewhere temporarily, but they're making it a big deal because it's fun.