The only thing that should be in there is her cervix. It is usually quite deep and shaped like a small donut. It is a cricular muscle with a depression (hole) in the center. Generally, we women find poking it uncomfortable and it should not be messed with for pleasure.

Some describe the G-Spot as having a slightly rough texture shaped somewhat as you describe. It would be one to two inches above the pubic bone on the front side of the vagina. Relatively few women have this as an easily identifiable spot. If this is what it is, you have stumbled onto what many look for for years. Many authorities doubt its existence. Rub it gently with the pad of a finger. She will feel like she has to pee but will learn to enjoy.

stimulate it and see if she likes