My grandma just passed. What's the "right" response to people saying that they're sorry for my loss? Thank you, sounds... hollow I guess? But I don't know what else to say

Sorry I wasn't sure where to even post this, but looking for suggestions. I keep obsessing about how stupid and cold thank you sounds as a response

I truly appreciate everyone's responses and I'm equally sorry for all the losses others have experienced as well. I'll give something like Thank you, she really was the best grandma a try. It's still really raw, I have to work on not ugly crying in response.

A related question - what got you through/past your grief? I know it never really goes away but what helped you cope? I'm lucky to be over 40 and only experience my first close loss at this age, but now I don't know how to deal.