Eir visited Vormir to check things first herself. Once she fully understood the condition to get Soul stone, she then plan to act accordingly.
The conditions weren't chear to her. First time Thanos threw Gamora off the cliff and got the stone, but second time Black widow threw herself off cliff so Clint could get the stone.
It was complicated and Eir plan to go there and know more about it personally. So with a journey of another three days on Starblade, she finally reached Vormir. Another three days it took to find the Soul stone cliff or mountain. She didn't know the name of the place as no living thing was on this planet to tell her.
Yeah, it was a dead planet. There was no soul living on this planet. And Red skull wasn't even born yet. Eir didn't knew who will great her now. As she made her way upward the mountain, she was greeted by a loud voice.
"A new face, introduse yourself, women, or you'll be faced with the wrath of the mighty Mumm-ra, the mutant god."
Eir found a floating head in the air taking to her. The floating head was rotten and looked like it was forcefully plucked out from the rest of the body. It was a bit unsightly but Eir was mostly concerned with what the guy was talking about.
"I'm Eir, doughter of Odin, from Asgard, I'm here to find whereabouts of Soul stone."
"Hohoho, a guest from far away land, i welcome you, to my kingdom, doughter of Asgard. Servents, prepare a feast for our guest, bring the dancers in the hall."
And soon Munn-ra started enjoying himself in the grand feast.
But there was no servents, no dancers, no feast, no hall, nothing. It didn't took long for Eir to understand that after living for so long in isolation, he has gone mad. He didn't knew what was real and what was not as he completely ignored Eir after the 'feast' started and he started to greet his other 'guests'.
So Eir left him and started to look around the place. She examined the magic circle in the sky which was there to complete the process of soul sacrifice and then provide the the Soul stone. It was really advance spell and with all her knowledge in sorcery she couldn't figure out any of it much less temper with it. So she left it alone.
So she came back to the Mumm-ra guy or his floting head and hit it with some spells to restore some sense into him. It didn't work all the way but it was enough to make him spill about the condition for getting soul stone.
"One has to jump from pole, which other had to feel inside a hole." That was what he said.
Eir understood that while the sacrifice was made, the other person had to feel a lose inside them as if they had a hole inside there heart.
Now with all this, she got out of Vormir and to find a planet suitable for her next actions, she closed her eyes and concentrated on the voices of mortal who were asking for her help. It was a power every God was born with. They just had to reach inside themselves to hear the prayers and requests made from mortals who had faith in them.
She located a desperate voice, and moved her ship in that direction. Now all that was left was to grant them their wish so she could get some follower and hopefully a sacrifice.