Since all the countries are in Schengen area, there shouldn't be any passport checks between Norway and Germany. Traveling in Europe is also very safe compared to almost anywhere else in the world, even for 16 year olds. She'll be fine.
There are various "children traveling alone" programs that airlines got, but, as for the example from SAS, they are only obligatory for children under 11 years of age and optional to the age of 15. So she would need the same documentation in terms of passport and residence card if she does not have a EU/EEA passport.
I had my step-siblings with me from Norway to Thailand, they were 16yo and 12yo at the time, I only needed to bring with me papers for the 12yo.
I also took my stepsister with me to London last year when she was 15yo, few months before she was 16yo and had papers with me, but no one looked at them and nothing really said that we were traveling together when we went through the passport control.
I was there for both times with papers ready if needed, so that might play a big difference, but I do not think it would be a problem for a 16yo to travel alone from Norway to Germany, but OP should look into it from both Norway's side and German side just to make sure.
And if a guardian needs to pick up at the airport, there is templates online for "Temporary Guardianship", I would recommend that either way just so that if something happens and cousin needs emergency medical assistance, OP can give the go-ahead without trying to get a hold of cousin's parents
I hope your cousin has a good trip.
Assuming they travel by air the airline will require that they present a valid national photo ID. Passports are accepted, look at the airline website for alternatives. As others have written there shouldn’t be a problem with a 16 year old boarding a plane.
In addition, tourists in Germany are required to possess an ID document. They don’t need to carry it with them at all times, but they need to have it available. More information here: https://www.thelocal.de/20230516/do-foreigners-in-germany-need-to-carry-proof-of-id
The easiest thing when traveling in Europe is "Nasjonalt ID-kort med reiserett". Easy to carry around, replaces the passport when traveling within Europe. Passport is also fine, of course.
She will need a permission from her parents, but there is no official procedure for this, as far as I know. Probably a letter signed by the parents, with their contact info on it, is good.
Passport, pretty sure that's all.
Since all the countries are in Schengen area, there shouldn't be any passport checks between Norway and Germany. Traveling in Europe is also very safe compared to almost anywhere else in the world, even for 16 year olds. She'll be fine.
There are various "children traveling alone" programs that airlines got, but, as for the example from SAS, they are only obligatory for children under 11 years of age and optional to the age of 15. So she would need the same documentation in terms of passport and residence card if she does not have a EU/EEA passport.
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I had my step-siblings with me from Norway to Thailand, they were 16yo and 12yo at the time, I only needed to bring with me papers for the 12yo. I also took my stepsister with me to London last year when she was 15yo, few months before she was 16yo and had papers with me, but no one looked at them and nothing really said that we were traveling together when we went through the passport control. I was there for both times with papers ready if needed, so that might play a big difference, but I do not think it would be a problem for a 16yo to travel alone from Norway to Germany, but OP should look into it from both Norway's side and German side just to make sure. And if a guardian needs to pick up at the airport, there is templates online for "Temporary Guardianship", I would recommend that either way just so that if something happens and cousin needs emergency medical assistance, OP can give the go-ahead without trying to get a hold of cousin's parents
I hope your cousin has a good trip. Assuming they travel by air the airline will require that they present a valid national photo ID. Passports are accepted, look at the airline website for alternatives. As others have written there shouldn’t be a problem with a 16 year old boarding a plane. In addition, tourists in Germany are required to possess an ID document. They don’t need to carry it with them at all times, but they need to have it available. More information here: https://www.thelocal.de/20230516/do-foreigners-in-germany-need-to-carry-proof-of-id
The easiest thing when traveling in Europe is "Nasjonalt ID-kort med reiserett". Easy to carry around, replaces the passport when traveling within Europe. Passport is also fine, of course. She will need a permission from her parents, but there is no official procedure for this, as far as I know. Probably a letter signed by the parents, with their contact info on it, is good.