I’m afraid that I can only echo what others have said. I understand why your friend is upset that she didn’t get to see her daughter married, that is sad, but equally, really your friend seems to have brought this on herself. If she never even allows her SiL into her house, I can’t see how she could have expected to be invited to the wedding. Very sad situation all round really. There are no winners here.
What is a reasonable minimum spend for an online grocery delivery??