I am sorry to hear what you have been wrestling with. I am trying to figure where you are as I have "aquaintances" that were JW Missionaries in the Falkland Islands, and if that is the same place that you are located. Maybe I am missing soemthing with the Location thing? nevermind on my part. (shaking my head)
But anyway, I am sure this is a difficult struggle, but in time she will come around, especially if she wants to have a relationship with a precious grandchild.
You can't make her come over to understand your reasoning, not now. But when she sees what a wonderful Mother you are, that the baby is beautiful, and that she can miss out on it's growth, my bet she will come around,
I have 2 grandchildren myself and I think they have a way of changing ones life for the better,
Take a deep breath, make it through the all the changes, have a beautiful baby (you will) and then give it some time. MY guess when the time is right to head to the hospital, she will be there for you, parents always do pull through at the most unexpected moments,
She does love you, she just doesn't know how to show it yet, and she'll love that grandbaby like you WONT Believe! The letter she sent was an emotional " knee jerk" reaction. In a few years, she will apologize for sending to you.
Take care
we are here for you,