HELLO, I THINK MY SON'S GIRLFRIEND WHO JUST HAD MY

HELLO, I THINK MY SON'S GIRLFRIEND WHO JUST HAD MY FIRST GRANDCHILD IS A NARCISSIST. SHE AND I ARE HAVING A HARD TIME GETTING ALONG BECAUSE SHE IS RUTHLESS AND TREATS US ALL BAD. NOW SHE IS DENYING US ANY VISITATION WITH MY GRANDCHILD. HOW DO I FIND OUT??