Bravo for your courage to talk about it with your T. I'm sorry she didn't change her mind, though. My T is always telling me the same thing: therapy is about me, not her. I want to be " in her life" but that's never going to happen. It's true that usually issues about T's are about you but in this case I think both of your Ts were wrong in not acknowledging your pain about your grandfather.

Can you go back to sessions twice a week? When you saw her that often, did you still feel the need to email? If not, that's one solution.

Would your T let you email without her replying? That's another option.

When I tried, due to my T's suggestion, not to email at all, I posted on here more. It was hard, but I managed. One day at a time. I talked with a couple of close friends more, too.
However, my T didn't forbid emailing. She left it up to me. So now, I email when I have the need. It seems to work. Last week I emailed once and she responded. This week I didn't email at all! I wish your T wouldn't totally forbid it. It's better when you are the one making the decision, not T.

I hope it works out for you.