Retained right of residence after divorce Question

Hi All,
I just want to confirm is this the right application form for Non-EU Retained right of residence after divorce from EU national.
Divorce after 3.5 years.
she was exercising her treaty rights all these 3.5 years and during divorce time.

https://www.gov.uk/government/uploads/s ... -03-17.pdf

If it is then Section 21 B. Do i have to provide her signature? What if i can't?

And in supporting documents valid passport copy is ok or i must submit her original passport?

thank you.