I've ran into a bug several times where one of the two girls (probably can happen to both, but never seen it) where they freeze in one of their pathing spots and stop moving, To which you must either:
A: Find a bottle and throw it near them, causing them to walk over, fixing it.
B: Have them spot you and hide in a hiding spot.
OR C: avoid the stuck ones area entirely unless they get stuck by the exit, to which you have to deal with them.
One time frankie got stuck by the entrance, before I even entered the main area, so its just something to watch out for, as it is entirely possible to be somewhere and they get stuck and your just screwed.