While Naomi is likely telling her sister to stay close to Lisa for to keep her sister safe in a way that feels like she’s giving her an important task, from Naomi’s point of view Lisa probably is a coward that gets scared easily. Of course, that’s the point of view of someone that probably doesn’t bat an eye skydiving into a volcano, so she probably views most sane people as cowards that get scared easily.

Naomi involving Ila is probably somewhat irresponsible, but Naomi isn’t really known for responsibility. Of course, irresponsible in the sense that she’s placing the mall in danger, more so than Ila.