She has the right to divorce him and that should be her only right.
However, i am unsure whether i think that all the children from the donor, those born in marriage should have rights, to the details of each other, later on.
This does effect some people, the thought that they have half siblings that they never knew.
I am supporting a relative (16), that i didn't know existed until 18 months ago, she is now living in a hostel. I have a sense that in some way myself and my DH (deceased) have let her down, even though we didn't know her.
She wasn't treated very well by her foster carer. i think that the research and support needs to catch up with the law over issues suchas this.
If this isn't discussed by the couple, then they have problems that they should sort out, it shouldn't take leglislation to sort it out for them.
It does make a mockery of paternal 'birth family' rights, tbh.