Tbf to Machino, Sofia literally appearing in her room was already a handful on top of her student responsibilities. Doesn't help that the other girls spawned in dotted around Japan where it'd be a little unreasonable for Machino to take time away from school just to travel around Japan with nary a clue as to where each girl landed.
Olivia's negative emotions here can't be faulted due to the above but I can't be sure how much she knows about why Machino couldn't be the one to look for her.
Anyways, FOR OLIVIA