Can you reopen a divorce if it is already finalized?

My friend was not represented by legal counsel in her divorce and be not able to obtain free legal aid due to the certainty that the divorce was filed in a state surrounded by which she does not live? does she have hope?
Most probably not. There is no "right to counsel" in civil (non-criminal) proceedings. She would enjoy to prove "fraud on the court", i.e. a degree of dishonesty by the other party which deceived the court into doing something it usually wouldn't. On what grounds? She doesn't want to be divorced?

If she wants to challenge the property settlement, odds are near is a time frame for her state duing which that needed to be done; I'd start with a call to the court clerk's office.
In the US, generally no. The court "retains jurisdiction" over child custody and support and any other matter that the court specifically states in the edict. Other issues are over with.

BTW, the divorce does not have to be filed surrounded by her state. It is filed in the state where the creature asking for it is qualified as a resident.

BUT--if your friend did not actually receive service of the papers and had no opportunity to respond that may allow her to reopen the case. That's outstandingly tough to do without a lawyer.
You can petition the court to modify the order or make change. It really depends on what she wants to do. If she wants to reverse the divorce, that can't happen, but yes, she can petition the court for other reason.
It depends what she wishes to change about her final divorce decree, but she should own spoken up before it was finalized. Tell her to get a legal representative in the state where the divorce happened and find out.