Molly has the same problem. She's a HUGE barker, has been ever since we first got her. She also, is usually the only one at the dog park barking.
I think getting the collar where it goes off when she barks is probably your best bet. I've had the one where you control and it did not work at all for Molly. It was a little hand held one and every time she would start barking, you press a button and they are supposed to stop.

Good Luck.