Lots of hugs

I also feel bad like she'll think we don't trust her with DD (which I don't!! LOL, but I don't want her to think that!).
I totally understand how you feel about that! Such a tricky one.

But... even if your Grandma does let her cry for a whole one hour, it probably won't do your DD any damage. It's the prolonged periods of crying without any attention over long periods of time (like months and years) that people are really worried about. And, you know, it will probably be totally fine, she'll bounce her on her knee the whole time 'cos she's so cute she won't be able to put her down.

Sometimes Grandmas are all talk. (I know mine are)