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.
[You're welcome.] She teleports back to Darcy, and re-visibles. "Well," she sighs. "Now I know."
"I thought it might work. Stars can do a lot. They can have big effects over entire planets. I guess they can't do this one thing." She shrugs. "Thank you for holding the door." She goes into Milliways.
She goes looking for Sherlock, solemn.
Bell sits in the kitchen and watches thoughtfully. "Found Darcy again," she says.
"Yeah. I went back to her world for a bit and fixed a bridge that she needed to commute between planets and there's a Tony in her world, who I met. He's thirty-seven and has a Jarvis but no Sherlock, twinned or cloned. And then after Darcy was bored holding the door for me, I tried resurrecting a guy who'd died in a war they had recently, to see if it'd work - and it doesn't. Not with a star, anyway, I don't know about Stella's 'evils'."
"Yeah. I'll push the immortality programs a little harder, I guess." She dismisses her illusion crown and picks up her real one from where it's sitting on the kitchen table.
"Well, I'm supposed to go meet Coin on that depopulated continent, talk colonization," says Bell, waving a hand. "I'll probably be back before the cupcakes are frosted, she can only take so much of me at a time. I love you!"
She waits a bit. [I wonder,] she says conversationally to Sherlock, [if Coin would be late to fewer things if I just gave her a teleportation pow]
And that is all.
Reflexively, she checks up on the named location with her perception-of-physical-structures power.
Then she sends her power looking for Coin and brainphones Tony.
[I need a hundred thousand triangles of pain. Right now. I'll explain later if I can.]
So he turns on the agony beam to the requested amount.
Sherlock can barely deal with the coin she is trying to make.
It turns out that the pentagon that modified her perception of pain was not... quite... sufficient.
But she can't take the time to readjust. She summons the concentration to make coins out of what she's feeling, and as soon as she summons the concentration to stop, she tells Tony [enough] and spends a declawed star to declaw one of her new eight-pointed coins.
Her wish is extremely specific. She wants Bell back. Not a version incompletely reconstructed from her own knowledge or any other secondary information, but the same person who was destroyed in a nuclear explosion a minute ago. She wants Bell back, right here, unharmed and unchanged and with complete memories of her life up to the point where she was murdered.
And she expands her perspective on both Coin and her own house, so as to spot any more threats before they arrive.
There's nothing incoming on the house.
(Coin doesn't, actually, know where Bell's magic comes from, or she would never have done something so incomplete and foolish.)
Coin is receiving a report that the bomb has gone off and as near as anyone in Thirteen can determine it got its target. "Thank you," she tells the report-deliverer, "that will be all."