The freezing was because of the trans.
Apparently the text messages have been published which state the wishes but I can't find them.
From what I've seen, the child wanted her sperm frozen so that when they had gender reassignment at age 18, they could have a biological child.
The mum now wants the sperm so she can use a donor and surrogate and "fulfil her daughter's wishes". I don't think I agree as the wishes were to be a parent of their own biological child. Not simple to give the mother a grandchild.
But you never know, the text messages may suggest otherwise.
I think it would be very unkind to the child.
I feel very sorry for the mother's loss but I don't think she should be doing what she's trying to do. Grandchild are not a right.