Today, after eight months, she does.
She makes sure that Sherlock and Tony are both awake, finds that they are but do not want to join her in the bar today unless she finds something interesting, checks her coin supply and finds it sufficient, and steps through.
"...Maybe," says Darcy. "It's probably gonna get complicated. The Asgardians and the guys Loki started the war with really don't like each other, so even if you could resurrect everybody, they might just go back to killing each other."
"Maybe just a few people, then. But it's sad when people die and if I can undo it I should. I can afford to wait in my world because all the people who have died there will still have died there in six months and then I'll have figured out how to reintegrate them. Everyone who lost the Hunger Games, everyone who was executed as a political dissident, and then I'll start taking special appeals when we've gotten through all those - if it works."
"We'll see, I guess." She glances at the door. "Okay, so if I take you to Asgard, will you try to fix the bridge? Because otherwise I don't actually think taking me back to Earth would help. Unless Sif wants to go too. But I don't think she does. And it would be," she smiles ruefully, "complicated."
"Well, I'll fix the bridge if I can, although it's possible that it's not amenable to fixing with the coins I have. What would be complicated?"
"I want to go back to Earth because it's, you know, my planet, but Sif's Asgardian and she's the one who's giving me the hero lessons, and if I did take her back to Earth we'd probably have to okay it with the nice people from the government," Darcy explains.
"You better let me handle the diplomacy while we're in Asgard," she says. "They take their kings kinda seriously."
"They won't be diplomatic with an offworld empress?" Shell Bell asks. "Even a slightly flippant one?"
"Ye-es," says Darcy, "but their idea of diplomatic sometimes involves challenging people to single combat. I get to skip a lot of that because Mewtwo's on my side."
Shell Bell sips her milkshake. "Is there a lot you'd want done as long as I'm there? Should I bring my girlfriend along? I can't make more significant magic without her, it's actually kind of a problem, the last time I met one of my alts I couldn't pass along the nifty magic because I was all out of coins from meeting the last one before that."
"Okay." Sip sip. "I want to go check the Belltower in case there's anyone there, but then I'll be happy to go back to your world - unless you're waiting for something or someone here?"
"Nope! Just hanging out with my best bud," she says, patting the hammer at her side.
Shell Bell finishes her shake, teleports up, finds the tower empty and nothing new in the book, and teleports back down. "Shall we?"
"Sif!" says Darcy, waving. "This is Shell Bell, I found her in Milliways, she says she can maybe fix the Bifrost, do you want to hold the door for us so we can go talk to Heimdall about it?"
"You have the most interesting friends," Sif says dryly, coming to take the door from them.
(She has quite forgotten that she illusioned up a crown - she'll remember if reminded, of course, but it's slipped from her attention without the weight on her head to remind her.)
"Thanks," says Darcy, and she turns to Bell. "Can you take us straight to the end of the bridge?"
"Sorry—there's only one end that's the end," she explains. "The other end is the beginning."