Finding the G-spot

I need help and am new here. My wife and I have finally learned to play with toys and experiementation after 20 years of "vanilla." She actually had her first clitoral orgasm just last year. I want to give her more, and am lost trying to find my wife's G-spot. If I put a finger inside on her anterior wall, I immediately find her pubic bone, this goes for about 1 1/2". Just past that is a soft tissue area about just like the rest of her vaginal tissue which is is about 1". Then just past that is a fairly large "bulblike" area that is fairly large (1"--2") roundish area. I assumed that this was her G-spot, but nothing seems to happen if I try to stimulate her in that area. Any advise is appreciated.