If orcs are relevantly capable of belief, then they count as people. Not necessarily good people, but people nonetheless.

Well. They're not people in any other relevant sense. Belief? So she gets more powerful if they believe her about being a god?

Yes, though somewhat indirectly. The more people who think of her, and the more often they do so, the larger her store of divine energy will be. With more energy, she can maintain a larger domain, and make more and larger-scale changes within it.

...can anyone become a god that way?

Short answer, no. Gods are not the same sort of being as mortals, and getting lots of people to think that you are a god will not cause you to become one.

That's disappointing. Do gods live forever -

Barring unfortunate circumstances such as loss of all their worshippers, yes.

Can they make worshippers live forever.

She cannot, nor can most others. There is a goddess of preservation near to her domain in Arabek who does a sort of immortality-with-upkeep, that is as close as she has heard of.

...how do they get that?

Figure out how to travel between worlds. It is not something gods can do, her presence here is an accident.

How did the accident happen? Are there records of other such accidents?

There was a curious tangle of light in the air. It disappeared when she touched it, and there has been no sign of it since. There are no written references to such tangles in any books she's read (she's the goddess of libraries, the set of books she's read is all of them). She can share the memory of it, if they'd like?

Oooooooh cool yes they would.

She touches them, and shares the avatar's viewpoint.

A tangle of light, draped just so, resting lightly almost as if it is physically tangible across her landscape, the hand reaches up and out as the body moves closer, into the light- And then there is an ocean, and it is wet.

How does that work, exactly? Can she do it again? Does she have a way back home?

It is her special blessing, a mind palace for the storage and organization of memories, shareable in parts. Usage is not limited.

The larger part of her is still back home, only this avatar was transported.

They want to see more memories!

She shares a brief moment of her overall perspective when nothing especially interesting was happening. There is still quite a lot of information, total awareness of 1600 square miles of land, the movement of wind and the passage of animals, swirling fog thicker here and bring down a drizzle of rain there, the fields require a day of sunshine, clear the clouds away, rebalance the soil composition, a visitor to the port makes an offering at the temple, accept it graciously with thanks, run through her sum of knowledge on his homeland-

The stagecoach is rather paralyzed with awe.

That is a characteristic sample of her memories. Further questions?

It takes them a minute. But then, yes. Immortality, they are definitely obsessed with immortality. Can she talk to the Valar, does her world have Elves or Dwarves -

No Elves, no Dwarves. There is no reason she could not talk with the Valar, except for the problem of getting their attention.

If she's a god she could probably just go to Valinor.

This is true. And she likely will, after establishing a sufficient presence here that loss of this avatar will not be as significant a blow as it might otherwise be.