Every time I've seen someone ask or I have asked about Jenna, the response has been a resounding "No," not quite as loud as when Lisa Ann gets asked about, but pretty close.
In terms of finding PSE's in San Diego, there are a few but they tend to come and go. You would probably be better off, if possible, to plan ahead and make the trip up to L.A. or perhaps see if you can work something out where you meet somewhere in the middle like O.C.
I don't know about a web site that lists specifically pornstars available in SD, but from perusing various boards I can tell you that the following porn stars are available regularly in SD -- at least from the advertisements.
I've seen Austin, she was pretty good. (I didn't review her, but I'd give her an 8,8)
There are a couple other former porn stars that do non-FS massage in SD. These aren't big names, but they're what's currently available down here.
For the record, all of these girls would qualify for the 300 club, based on their published rates.
she doesnt do privates she thinks she is too good for that... however i am actually in the sd area, north county to be exact, i am available through body miracle, and if you have many referances i dont mind not going through the agency, hit me up firstname.lastname@example.org