No one grounding technique works for everyone. We as a group have a spatial processing disorder, so something like that wouldn't work for us. Visualization-based stuff doesn't work for us either.

It's okay if you need to find other grounding techniques. I spent two months in an inpatient trauma program thinking I was stupid because none of their techniques worked for me, until finally another patient suggested that maybe those techniques weren't working for me because I'm not a visual learner. I'm a strong auditory and kinesthetic learner, so grounding skills based on those senses work better for me.

Do you know what kind of learner you are or what sense[s] you use most? That'll make it a lot easier to figure out grounding skills that will work for you.

And it's okay to tell your therapist that the grounding skills she's suggesting aren't working. She may have other ideas for alternatives that might work better for you.