It was only a silly hide and seek game that Wren made Quinn play, but who knew the girl was actually really good at hiding?. No one has seen or heard from her since after Tyler's birthday party. Principal Young became very disturbed about her daughter's disappearance and had to call Wren into the office.
She's the one who told Quinn to hide, so she probably knows where Quinn could be hiding. At first, Wren was the one to disappear from the pack, now it's Quinn. Who's going to be the next one to disappear?. Whoever it is, Principal Young doesn't care. All she cares about right now is to find her pup, Quinn.
She has had her ups and down with her but Quinn's her only pup, so she has to find her. It hasn't been announced officially that Quinn's missing like they did with Wren, so no one's bothered about looking for her except for her friends. Friend to be precise, Eve's not really on Quinn's list of friends anymore.