Of course this bitch is a flake! She wouldn't be in porno if she could hold down a regular gig. Here's what I would do..

Just keep a bunch of guys hanging around the warehouse all day - smoking, drinking beer, whatever. When some bitch comes into your office, bring her out back and have the guys work their magic.

This way, the bimbo won't have a chance to use the "drug binge" excuse for not being able to read a clock.