Again, step it back. Your daughter and her fiancé could EASILY be married in their own parishes. It is only because they want to get married somewhere else, with people who don’t know them and aren’t preparing them for marriage involved, that they have any extra steps to take.
The pastor in this third location has NO canonical jurisdiction over the two of them, is not their pastor so has no pastoral relationship with them either, and is under no obligation to take on their wedding. If he chooses to, wonderful, some pastor do.
For example, the pastor of my parish is the pastor of three parishes that cover 80 miles one way between the two most distant. He is already running all over for weddings, funerals, sick calls, and masses at the three parishes on the weekends. He would not be inclined to add a wedding of people he doesn’t know and have to go through all the extra paperwork because he frankly is stretched thin already ministering to his own parishioners.
Another pastor may be in a different situation and feel that he can take on the wedding of non-parishioners. It’s not about anyone wanting to make it “hard” on your daughter or future son-in-law, it is about your daughter and son-in-law not really having a firm grasp of what they are actually asking others to do for them with so little regard for their own time and schedules.
But you are going to get much further with pastor-to-pastor contact than the random-person-calling-the-parish-office approach.
In the end, it is both pastors who have to agree to this plan. So, your daughter needs to talk to her pastor.