Stop explaining. Stop defending. You cannot fix this and you need to let it go. She will feel however she is going to feel, rightfully or not, and there is nothing you can do to convince her otherwise.

Unfortunately, this also means that unless your son steps up to make sure you have a relationship with your grandchild, that relationship will go by the wayside.

Also, she is not "taking away" your son. Your son is going WILLINGLY. Pay attention to that. He can choose to come around or bring his child around and he seems to be choosing not to. Why don't you ask him why?

For what it's worth, I also read a LOT of judgment on your part toward her culture and her "coldness", their choice AS PARENTS to be very careful with quarantine/lockdown. I don't think her feelings are coming from nowhere - but again you cannot fix this or defend yourself, so let it all go.