It's my understanding that Chloe is not currently available and hasn't been available for several months now.  
You can always go straight to the source however by contacting Holly of After Dark at 617-451-0414 (after 5:30pm).  Personally, I've found Holly to be reasonably straightforward (and pleasant) about most such matters.
Cheers, Ray

Last time I taled to Holly (about two weeks ago) she informed that the Chloe is no longer with them.  Too bad since she was one of my favorites.  You could always try asking one of the other girls if she is still in the area and if she is working.  I believe she and Ada were on friendly terms.