If My Friend’s Ex-Husband Refused to Participate in the Annulment Process, Does that Mean She Can’t Get One?

No. Either party can petition for an annulment. Canon 1510 specifically provides for a respondent who refuses to accept a legitimately served citation, and Canon 1592 §1 allows the judge (tribunal) “to declare the respondent absent from the trial and decree that the case is to proceed to the definitive sentence and its execution.” You might ask the candidate to pick up a copy of Edward N. Peters’ book, Annulments and the Catholic Church: Straight Answers to Tough Questions.