I'm not really familiar with geese breeds (and you're right, them being white makes that a little harder!) But I don't think theres a specific way to force a bird to go broody, is it possible for you to get or build an incubator? That way you could hatch some goslings without waiting to see if your goose will go broody or not! : D Good luck!
Hey, thank you.

Yes, being a white goose and searching for a ID is like a
Don Quijote fight with windmills.
I may contact some people in Serbia again.
The mother of these geese is from a man who lives in Syrmia (region mainly in Serbia and partly in Croatia), so they know the best. I will surely come up with the answer what breed it is or is it mixed, domestic or...

Now it seems like it is a Syrmian goose, maybe Banat goose or Bačka goose. (guska is a Serbian translation for a goose, and all those regions are in North Serbia). So, definetely I should contact them once again.
Well, I have heard in Serbia on geese forums (people couldn't help me to identify the specie even with a larger flock and videos) something regarding the incubators. Nevertheless, the specie it is not important now so much. However, regarding the geese forums in Serbia - people have problems with incubators - many eggs won't develop successfully. Even with bought incubators.
However, there is an incubator trick.

Heh. If you have any other animal like turkey and even a chick that gets brooded, you can lay down the goose eggs instead of their own eggs and to produce them like that.
My grandpa has taught me that.
However, there is a trick regarding the eggs. The geese eggs have a very thick shell. So, the most important thing regarding the geese eggs is to somewhere on the 15th day of some other chick or turkey or duck laying on them - to start wetting the egg. My grandpa successfully did that every couple of days from 15th day approximately, and when it was a final day for geese to breed, he just helped 4 eggs - by making a small whole, very tiny whole, just for them to have air. The fifth egg even didn't have to get a whole from my grandpa, it was born naturally.
So, regarding the incubators, people should know that they have to mimic the goose behaviour when she's brooded and laying on eggs, because a goose is wetting her eggs from the 15th days. I guess you all know that. And maybe that's the reason why people here with incubators can't really produce geese. I right now have no time for an incubator - in a way to make it, but I ve shared a natural incubator trick which anyone in the community can try. Goose do that because she is aware of the thing that her eggs are very shell powered, so she soften it with water and when she is laying on eggs, the heat she produce is making the eggs' shell becoming softer - and the baby goose can get out.

Funny thing.

Thanks!
They’re white geese and considering that you said they’re sometimes called “Italian” my guess is that they’re what we in America call Roman Geese, which are one of the oldest breeds in the world.
You Can’t really make her go broody, it’s something she’ll decide to do on her own, but from what I can tell you about my Roman goose is that she didn’t go broody her first year, she’ll be more likely her second year, 8 months is very young for a Roman Goose to go broody.
Hey, thanks very much. It is not tufted Roman Goose, I've researched and there is a Classic Roman Goose. Nevertheless, the specie is not important now - only in terms of getting brooded. I ve mentioned above.
Yes, 8 months is very short period of time, I guess maybe with spring here she may get brooded, but depends. However, goose eggs can stay for a longer period of time and to be still fertile, so I will wait for her, and put eggs under the chicks maybe.
Regarding the trick how to make them broody. Well, my grandpa is a farmer his whole life, he said that giving yeast/ferment to chickens help them to get brooded.

Maybe it doesn't have the same effect on geese, though, but who knows.

Well, the Roman Goose whether Classic or Tufted saved the Rome literally.

Which is a very nice thing about goose to know.
However, their population in the world is shrinking in terms that people are not interesting for a goose meet, which is a red meat as I know - and by that much healthier than the meat of chicks - let's say.
Nevertheless, I hope your goose get broody ad you have little goslings.

They are so cute. I prefer ducklings in the reality, because ducklings are more cheerful, and not agressive as goose, but ok, what to do.

I had ducklngs.
The "strange" anatomy you are referring to is a condition caused by dietary problem called "angel wing". Do some reading on the subject so it doesn't happen to your goslings that will be on the way shortly.
Hey, thank you, I ll do that. So it is not genetical, but dietary, and we all thought here that it is genetical problem, but "the angel wing" is not. Which is great.
The interesting thing about mine goose is that she layed double eggs in terms of double yolk three times. They were much bigger than the rest of them and we crashed the egg and saw double yolks, but I got in the meantime three eggs from another specie Chinese Goose or African goose.
I have one more question. WIl the couple accept baby goslings if the mother goose don't get brooded and I put eggs into the incubator or under the chick?
Best regards and thanks sincerely for help to all of you, and I will update this topic when I find new information or anything.