Only my daughters can remove this pain. Only God can heal it.
You can resolve this issue yourself, by accepting your granddaughter for who she is. Or you can remain a miserable bigot with a family divided by hate and intolerance till the day you die.
It seems your pride and your hate are more important to you than your family. Hopefully your other grandchildren reject your poison as they grow older and abandon you to your self-imposed martyrdom.