How would you handle this family situation?

My family is not close, geographically or emotionally. My paternal grandfather died this weekend and my grandmother said she doesn’t want to have any kind of memorial service and she doesn’t want anyone to come visit. She is on the east coast and my father, my sister, and I are all out west.

I told her I’d like to come see her and help out with anything that needs to get taken care of while I’m there. She told me not to come.

My instinct is to just go out there, and hopefully she’ll see me once I’m there. Is this disrespectful, since she’s been clear that she doesn’t want to see anyone? What am I supposed to do?