Gosh...she doesn't really sound like a two-timer. Somone mentioned earlier in your first thread she could be in heat. That sounds likely to me. My guess would be her first owners didn't get her spayed, and she got past cute kitty stage and is now in heat so they dumped her. That could explain all the crying she seems to do.
How about an ad in the newspaper? We have a paper here that doesn't charge for lost/found ads. Mabye your local news would flash a picture up for you? And I would contact area shelters too, and maybe give them a picture of her. THat way if her owners are looking for her...they will probably call the shelter.
Good luck!!!

petfinder also has a lost/found site don't they?