They Needed a Plan… And Fast
The thing about packing up all of her stuff was that leaving it anywhere else in the house would defeat the purpose of evicting her. That’s because the stuff went from being out of the way in the room to being in the way in another room they used.
They couldn’t risk leaving her stuff on the porch to make matters more complicated. If anything happened to the third roommate’s items, Lud Wid and her friend would be liable. This would give the third girl too much ammo against them; they needed another plan.